Patchy Hair Loss or Scalp Infection? Key Clues

Here's a number that stops most people mid-scroll: a nationally representative Australian survey estimated the lifetime prevalence of alopecia areata among Australians aged 15 and over at between 1.2% and 2.3% — meaning somewhere in the vicinity of a quarter to half a million adults in this country have, at some point, watched a coin-sized patch of hair vanish from their scalp . And that's just one cause of patchy hair loss. Add scalp fungal infections — which are so common in Australian primary schools that health services describe scalp scaling plus thinning in a child as an immediate red flag for tinea capitis — and suddenly that "weird bald spot" you found in the bathroom mirror has a very crowded list of suspects.

If you've ever run your fingers over a smooth, unexpected patch of scalp and felt your stomach drop, you are far from alone. Sudden bald patches are one of the most anxiety-inducing things a body can spring on you, partly because hair is so tied up in how we see ourselves, and partly because the internet offers roughly 400 conflicting explanations within eleven seconds of searching. Is it stress? Is it contagious? Is it permanent? Do you need a cream, a tablet, a specialist, or just patience?

This article is here to untangle that. We're a telehealth service that speaks with Australians every day about skin and scalp concerns — issuing online consultations, prescriptions, specialist referrals and medical certificates — and patchy hair loss is a recurring theme in those conversations. So we've pulled together what the evidence and Australian clinical guidance actually say about the two most commonly confused culprits: alopecia areata (an autoimmune condition) and scalp ringworm, or tinea capitis (a fungal infection). We'll walk through what each one typically looks and feels like, the subtle clues doctors use to tell them apart, the other impostors that muddy the picture, why self-diagnosis genuinely is difficult even for experienced clinicians, and — importantly — when a bald patch is a "book an appointment this week" situation rather than a "watch and wait" one.

By the end, you'll have a much clearer sense of what your scalp might be trying to tell you, and a practical plan for what to do next. Let's get into it.

First, a quick tour of how hair actually grows

To understand why hair falls out in patches, it helps to know that your hair isn't growing on one synchronised schedule. Each follicle cycles independently through a growth phase (anagen), a brief transition (catagen), and a resting phase (telogen) before the hair sheds and the follicle starts again. At any moment, the vast majority of your roughly 100,000 scalp follicles are in growth mode, which is why shedding 50–100 hairs a day is completely normal and not worth panicking over.

Patchy loss is different. It means something has interrupted that cycle in a localised way — either the immune system has attacked follicles in a specific area, an infection has invaded the hair shafts, physical force has pulled hairs out, or scarring has destroyed follicles altogether.

That last distinction matters enormously. Dermatologists sort hair loss into non-scarring (the follicle is still alive and regrowth is possible) and scarring (the follicle is permanently replaced by fibrous tissue). Alopecia areata is non-scarring. Untreated tinea capitis, particularly the severe inflammatory form, can become scarring. That's one of several reasons the "wait and see if it grows back" approach can backfire.

Alopecia areata: when your immune system misidentifies your follicles

Alopecia areata is an autoimmune condition in which the immune system mistakenly targets hair follicles, causing non-scarring hair loss in one or more areas of the scalp, face or body, as healthdirect explains. The follicles aren't destroyed — they're essentially switched off — which is why regrowth is genuinely possible, sometimes spontaneously.

What it typically looks like

The patch itself is usually smooth. This is the single most useful clue for most people. Classic alopecia areata produces round or oval bald patches where the underlying skin looks essentially normal: no thick scale, no crusting, no pus, no obvious redness. People often describe it as "peach-smooth." You may notice it in the shower, or a hairdresser or partner spots it before you do.

It appears fast. Alopecia areata has a knack for sudden onset — a patch can develop over days to a couple of weeks, which is part of why it's so unsettling.

Exclamation mark hairs. At the edges of an active patch, doctors look for short broken hairs that are thicker at the tip and taper down to a thin point where they enter the scalp — described on DermNet as exclamation point hairs, resulting from an abrupt halt in the growth phase and weakening of the hair shaft. They're a hallmark of active disease and are much easier to see under a dermatoscope than with the naked eye.

Nail changes. Tiny pits or dents in the fingernails, like the surface of a thimble, show up in a subset of people and can be a helpful supporting clue.

Itch or tingling — sometimes. A minority of people report burning or itching in the affected area before or during hair loss, according to the National Alopecia Areata Foundation. But most people feel nothing at all, which is a key contrast with fungal infection.

"Going white overnight." Alopecia areata tends to preferentially attack pigmented hairs, so existing grey hairs can be left behind — the origin of those dramatic stories about hair turning white from shock. Early regrowth often comes back fine, soft and white before pigment returns.

Who gets it, and what happens next

It can start at any age but Australian primary care data found prevalence highest in the 19-to-34 age bracket. It's also associated with other autoimmune conditions — thyroid disease, vitiligo, coeliac disease, type 1 diabetes — and with atopic conditions like eczema and asthma, which is why a doctor may order blood tests even when the scalp diagnosis seems obvious.

The outlook is genuinely variable, and it's worth being honest about that. An Australian expert consensus statement on alopecia areata treatment notes that around 40% of affected people only ever develop a single patch and achieve spontaneous, durable remission within six months. Others experience recurring episodes or more extensive loss. Severity ranges from one small patch to complete loss of scalp hair, body hair, eyelashes and eyebrows.

Two takeaways from that: first, a single small patch often has a good prognosis. Second, "often" is not "always," and you can't tell which camp you're in from a mirror.

Tinea capitis: scalp ringworm, and why "ringworm" is a terrible name

Let's clear this up immediately — there is no worm. Tinea capitis is a fungal infection of the scalp and hair shafts caused by dermatophytes. Western Australian dermatology pre-referral guidance identifies Trichophyton tonsurans as the most frequent cause in Australia, and describes the typical picture as scalp scaling — flaking that may be patchy or spread across the whole scalp — with hair thinning or hair breakage developing over time.

What it typically looks like

Scale is the giveaway. Where alopecia areata gives you smooth skin, tinea capitis usually gives you flaking, scaling, roughness or crusting. It's frequently mistaken for stubborn dandruff or cradle cap that won't shift.

Hair breaks rather than falls. Because the fungus invades the hair shaft itself, hairs snap off at or just above the scalp surface. This produces a patch of stubble rather than bare skin, and sometimes the classic "black dot" appearance — tiny dark points where broken hairs remain in the follicle openings. Run your hand over it and it feels like sandpaper, not silk.

Itch is common. Not universal, but common.

Irregular borders. Tinea patches often have less tidy, less geometric outlines than alopecia areata patches, and may show redness or a scaly rim.

Swollen glands. Tender lymph nodes at the back of the neck or behind the ears are a classic accompanying sign — one that essentially never occurs with uncomplicated alopecia areata.

Kerion — the severe form. Sometimes tinea capitis triggers an intense inflammatory reaction deep in the follicles. The same WA guidance describes a kerion as presenting with follicular pustules or boggy, swollen areas with pus-like discharge. It can look alarmingly like a bacterial abscess, is often painful, and if untreated can cause permanent scarring hair loss. This is the scenario where delay genuinely costs you hair.

Who gets it, and how it spreads

Tinea capitis is overwhelmingly a condition of childhood — Raising Children Network describes it as the most common fungal infection in children. It becomes uncommon after puberty, thought to be related to changes in scalp oil composition that make the environment less hospitable to the fungus. It does still occur in adults, particularly in those who are immunocompromised.

Crucially — and unlike alopecia areata — it's contagious. It spreads through direct head-to-head contact, and via shared hats, helmets, pillows, towels, hairbrushes, clippers and hair ties. It can also come from animals: kittens, puppies and guinea pigs are classic Australian sources, so a new pet plus a scaly scalp patch in a child is a meaningful combination. Barbers and hairdressers using inadequately disinfected clippers are another documented route.

If one child in a household has it, siblings and close contacts frequently need checking too, because asymptomatic carriers can quietly keep reinfecting everyone.

Why creams alone won't fix it

This is the most important practical difference, and the one that trips up the most families. Because the fungus lives inside the hair shaft and follicle, topical antifungal creams and shampoos cannot reach it on their own. Systemic treatment is required — a review in American Family Physician notes that oral terbinafine is first-line for tinea capitis, while griseofulvin is preferred for kerion unless Trichophyton has been confirmed. The WA pre-referral guidelines similarly state that tinea capitis needs oral medication, typically for a minimum of four weeks, with options including terbinafine, griseofulvin and itraconazole.

Medicated shampoos still have a role, but a supporting one: used alongside oral treatment in the early weeks, agents such as selenium sulfide or ketoconazole shampoo may help reduce spread to others. Months of chemist-bought antifungal cream, on its own, is months of the infection continuing to do damage.

The key clues, side by side

Here's the mental checklist, condensed.

Lean towards alopecia areata if:

• The bald patch is smooth, clean and normal-coloured
• There's no flaking, crusting or pus
• The outline is round or oval and well-defined
• The hair is gone at skin level rather than broken off as stubble
• There's little or no itch
• You've noticed fingernail pitting
• Nobody in the household has anything similar
• You have a personal or family history of autoimmune conditions
• Short white or fine hairs are reappearing in the centre

Lean towards tinea capitis if:

• The patch is scaly, flaky, rough, red or crusted
• You can see or feel black dots or broken stubble
• It's itchy
• Neck or behind-ear glands are swollen
• There's a boggy, pus-filled or tender swelling (possible kerion)
• The affected person is a primary-school-aged child
• Other family members, classmates or a new pet have skin or coat problems
• It's been slowly expanding over weeks rather than appearing overnight

Seek same-week care regardless if: the area is painful, pus is present, there's fever, the patch is expanding rapidly, you're losing eyebrows or eyelashes, you're immunocompromised, or the skin looks shiny and smooth with visible loss of follicle openings (a possible sign of scarring alopecia).

The impostors nobody warns you about

Alopecia areata and tinea capitis get the headlines, but plenty of other conditions cause patchy or unexpected hair loss.

Traction alopecia. Caused by chronic pulling from tight ponytails, buns, braids, extensions, weaves or hijab pins. Typically affects the hairline and temples. Reversible early, permanent if the tension continues for years.

Trichotillomania. A body-focused repetitive behaviour involving hair pulling. Produces irregular patches with hairs of varying lengths — a picture that can closely mimic other causes and deserves compassionate, non-judgemental care rather than shame.

Telogen effluvium. Diffuse shedding two to three months after a major stressor — serious illness, surgery, childbirth, crash dieting, iron deficiency, a significant emotional event. Usually thinning all over rather than in patches, but it can make existing patches more noticeable.

Bacterial folliculitis. Inflammation of hair follicles, most commonly due to Staphylococcus aureus, as outlined by the Australasian College of Dermatologists. Produces pustules and can be confused with kerion.

Scalp psoriasis and seborrhoeic dermatitis. Both cause scale and can cause temporary hair loss from scratching and inflammation — and both are frequently misidentified as fungal infection.

Scarring alopecias. Conditions such as lichen planopilaris and frontal fibrosing alopecia destroy follicles permanently. Early recognition is the entire ball game, because treatment aims to halt progression rather than regrow what's lost.

Syphilitic alopecia. Here's one worth knowing about, particularly given rising syphilis notifications in Australia. Secondary syphilis can cause a distinctive "moth-eaten" pattern of patchy hair loss. A CMAJ clinical report notes that hair loss occurs in roughly 3–7% of secondary syphilis cases and that alopecia can occasionally be the only presenting feature — with published cases of it being initially misdiagnosed as alopecia areata. If you have patchy hair loss along with any rash (especially on palms or soles), mouth ulcers, swollen glands or a recent change in sexual partners, mention it to your doctor and ask about STI screening. It's a five-minute conversation that can prevent serious long-term complications, and syphilis is entirely curable with appropriate antibiotics.

Why self-diagnosis is genuinely difficult

We're not going to pretend you should never search your symptoms — you're reading a health article right now, and informed patients get better care. But there are structural reasons why scalp diagnosis defeats the naked eye.

The presentations overlap. Early tinea capitis with minimal scale looks like alopecia areata. Alopecia areata with coexisting seborrhoeic dermatitis looks like tinea. Trichotillomania looks like both.

Image searching is a trap. Online photos skew towards florid, textbook, late-stage examples. Real early disease is subtle. Also, the vast majority of publicly available dermatology images depict lighter skin tones, which makes redness- and inflammation-based cues unreliable for many Australians with darker skin.

The confirming clues are invisible without equipment. Exclamation mark hairs, black dots, yellow dots, comma hairs and corkscrew hairs are dermoscopic findings. A clinician's dermatoscope magnifies and polarises light in a way your phone camera can't replicate.

Fungal diagnosis often needs a laboratory. Definitive confirmation typically comes from scalp scrapings and plucked hairs sent for microscopy and fungal culture. Culture takes time but identifies the organism, which influences drug choice and duration. Some species fluoresce under a Wood's lamp — but notably, Trichophyton tonsurans, the most common Australian culprit, generally does not, so a negative lamp test rules nothing out.

The wrong treatment makes things worse. Topical steroids applied to undiagnosed tinea can suppress inflammation while the fungus spreads, producing a confusing altered picture sometimes called "tinea incognito." Conversely, weeks of unnecessary oral antifungals for alopecia areata means side effects, cost, and lost time.

What happens when you get it checked — the Australian pathway

Step one is a consultation with a GP. Expect questions about timeline, itch, pain, household and pet contacts, recent illnesses or stressors, medications, family history of autoimmune disease, and your general health. Expect a look at your scalp, nails, eyebrows, eyelashes and possibly other body areas.

From there:

• Suspected tinea capitis: scrapings and hair samples for microscopy and culture, then oral antifungal therapy for at least four weeks, often with adjunctive medicated shampoo. Household contacts may need screening. Children can usually return to school once treatment has commenced — paediatric guidance supports return once treatment has started rather than prolonged exclusion, though check your school's specific policy.
• Suspected alopecia areata: possible blood tests for thyroid function, iron studies and other autoimmune markers. Treatment options depend on extent and may include potent topical corticosteroids, intralesional steroid injections, topical minoxidil, or — for extensive or refractory disease — referral to a dermatologist for consideration of systemic options, including newer JAK inhibitor therapies.
• Uncertain or not responding: dermatologist referral, potentially with a scalp biopsy.

Don't overlook the psychological side. healthdirect's alopecia resource specifically signposts support through the Australia Alopecia Areata Foundation and mental health support via Beyond Blue on 1300 22 4636, and notes that information about wigs and financial assistance is available. Hair loss affects mood, confidence, work and relationships. Raising it with your doctor is not vanity — it's relevant clinical information.

How we can help

We built our service around the reality that Australians are busy, and that "I'll book something when I get a chance" often turns into six months of an untreated scalp patch.

Through our [online telehealth consultations](https://nextclinic.com.au/), you can discuss patchy hair loss with an Australian-registered practitioner without taking half a day off work or sitting in a waiting room. You can upload clear, well-lit photos of the affected area beforehand, which gives the clinician a genuine head start. Good photo technique matters: use natural daylight, part the hair to show the scalp clearly, take one wide shot for context and one close-up, and include a coin or fingertip for scale.

Where it's clinically appropriate, we can arrange an [online prescription](https://nextclinic.com.au/) and, where specialist input is needed, issue a [referral to a dermatologist](https://nextclinic.com.au/). If a scalp condition — or the medical appointments and investigations that come with it — means you need time away from work or study, we can also issue an [online medical certificate](https://nextclinic.com.au/). You'll find more on how these services work, along with plenty of other health explainers, over on our blog.

We'll also be straight with you about the limits. Telehealth can't take a scalp scraping, perform dermoscopy, or do a biopsy. What it can do extremely well is triage: help you understand what's likely going on, start appropriate treatment where safe, and — critically — tell you promptly when you need hands-on assessment rather than letting the problem drift. For a kerion, a suspected scarring alopecia, or any presentation needing laboratory confirmation, we'll direct you to in-person care, and we'd rather do that in an hour than have you guess for a month.

Everyday things that genuinely help

While you're getting a diagnosis sorted, a few practical measures are worth adopting.

Stop sharing hairbrushes, combs, hats, helmets and towels within the household — this matters enormously if fungal infection is even a possibility. Wash pillowcases in hot water. Have the family pet checked by a vet if it has bald or scaly patches in its coat. Loosen tight hairstyles and give your hairline a break. Skip the aggressive DIY remedies — tea tree oil, apple cider vinegar, garlic pastes and onion juice are scalp-irritant favourites of the internet with negligible evidence and a real capacity to inflame already-unhappy skin. Don't apply leftover steroid cream from a previous prescription to an undiagnosed scalp patch. And if regrowth is under way, protect that fragile new hair from heat styling, bleaching and tight ties, and protect any bare scalp from the Australian sun with a hat or sunscreen, because exposed scalp burns fast.

The bottom line

Patchy hair loss is not one condition — it's a symptom with a long list of causes, and the distinction between them changes everything about treatment.

The clues worth remembering: alopecia areata typically gives you smooth, clean, well-defined patches that appear quickly, often with exclamation mark hairs at the edges and sometimes nail pitting, and it isn't contagious. Tinea capitis typically gives you scale, itch, broken stubble or black dots, sometimes swollen neck glands, mostly in children, it spreads between people and pets, and it needs oral antifungal medication because creams can't reach the fungus inside the hair shaft. Beyond those two sit traction alopecia, trichotillomania, telogen effluvium, folliculitis, psoriasis, scarring alopecias and even syphilis — which is exactly why confident self-diagnosis from a mirror and a search engine is so difficult. And while around 40% of people with alopecia areata get a single patch that resolves on its own within six months, an untreated kerion or an unrecognised scarring alopecia can cost you hair permanently. The downside of checking is a short appointment. The downside of not checking can be irreversible.

So here's our challenge to you this week: pick one action and actually do it. Take a proper, well-lit, dated photograph of the patch with something for scale, so you have an objective baseline instead of relying on memory. Or run through the two clue lists above and write down which side your symptoms fall on. Or — the one we'd most like you to choose — book a consultation and get an actual answer, whether that's with your regular GP or with us online.

Then tell us how you went. Which strategy did you pick, and what did you find? Drop a comment below — your experience might be exactly what nudges the next reader to stop guessing and start getting answers.

This article is general information only and is not a substitute for personalised medical advice. Please consult a qualified health professional about your individual circumstances. If you're experiencing severe pain, fever, or rapidly spreading infection, seek urgent medical care, or call 000 in an emergency.

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