Scalp care
Scalp warning signs: when a bump or spot needs a doctor
Most things on a scalp are harmless. But a bald head is hard to keep an eye on, so a handful of changes are worth a dermatologist's look rather than a wait. Here's what to watch for — and what usually isn't a worry.
Updated July 20, 2026
None of this is meant to scare you. It's the opposite — knowing the few signals that matter means you can stop second-guessing every freckle and get on with your life, while catching the rare thing that's worth catching.
Quick, important framing: this page can't diagnose anything, and it isn't a substitute for a professional. It's a guide to when to get checked. When in doubt, get it checked — and know that caught early, skin cancer is highly treatable.[source] See our not-medical-advice page for where we draw the line.
Get a dermatologist's eye on it if…
A spot is changing
A harmless sun spot is flat, evenly colored, with a clear border, and it stays put. Get any spot checked that's changing in size, shape, or color, has uneven color or a ragged border, or itches, bleeds, or won't heal. Some skin cancers look like ordinary spots — which is why treating one yourself as a blemish can let something more serious go unnoticed.[source] (Background on the harmless kind is in the sun spots guide.)
A rough, scaly, sandpapery patch
A persistent rough patch that feels like sandpaper can be an actinic keratosis — a precancerous spot from sun damage that's common on bald scalps and can develop into squamous cell carcinoma, the most common scalp skin cancer, if left.[source] Worth getting looked at rather than buffed away.
Firm, itchy bumps low on the back of the scalp or neck
Bumps there that look like razor bumps but don't clear can be acne keloidalis nuchae. Caught early it's manageable; left alone it can lead to raised scars and permanent hair loss, so it's worth an early check.[source] (Prevention and shaving technique are in the razor bumps guide.)
Persistent flaking that's also itchy or red
Ordinary dryness responds to moisturizing. Flaking that's also itchy, red, or greasy-scaly and won't settle can be a skin condition like seborrhoeic dermatitis, which needs different treatment than a moisturizer.[source] (For plain dryness, see the moisturizer guide.)
A bump that's infected, or bumps that scar
A bump that turns painful, swollen, or pus-filled may be infected — stop shaving over it and get it seen. And if razor bumps keep coming back, or leave scars or dark marks, despite better shaving habits, that's a dermatologic issue worth professional help rather than another product.[source]
Common questions
Most scalp spots are harmless, right?
Yes — the large majority of bumps, spots, and dry patches on a scalp are benign. The point of this page isn't to worry you; it's that the top of your head is hard to see, so a few specific changes are worth a quick check rather than a wait.
How do I even check the back of my head?
Use the same two-mirror setup you'd use to shave — a wall mirror behind you and a handheld in front — or ask a partner or barber to take a look every so often. Run your hand over your scalp too; you'll often feel a rough or raised patch before you see it.
Is it worth seeing a dermatologist if I'm not sure?
Yes. A skin check is quick, and the cost of waiting on something that turns out to matter is far higher than the cost of a visit that turns out to be nothing. When skin cancer is caught early, it's highly treatable.