Bumpy scalp: causes and when to seek help
Lumps on the scalp are common and usually harmless, but they can have various causes: folliculitis, sebaceous cysts, eczema, or psoriasis. The appearance, feel, and how long the lumps have been there can help determine whether gentle hair care is enough or whether you should see a doctor.
It’s easy to feel worried when you notice lumps on your scalp. Most are benign and are so-called epidermal cysts or follicular inflammation, and respond to gentle hair care. But some lumps should be assessed by a doctor.
Learn more about scalp health in our complete guide to scalp health.
Common causes of scalp lumps
| Type | How it feels | Common cause |
|---|---|---|
| Folliculitis | Small, red, tender bumps around hair follicles, sometimes filled with pus | Bacteria, sweat, friction from a hat or helmet |
| Sebaceous cyst | Smooth, movable lump under the skin, painless | Blocked sebaceous gland |
| Psoriasis bumps | Raised red patches with silvery-white scales | Autoimmune disease |
| Contact dermatitis | Small itchy bumps, redness | Allergy to fragrance, sulfates, or hair dye |
| Slightly raised lump (lipoma) | Soft, movable lump that grows slowly and is painless | Benign buildup of fat |
Learn more about rashes and redness in our guide to scalp rashes and about scalp psoriasis.
Scalp folliculitis: the most common cause
Folliculitis is inflammation of the hair follicle, usually caused by bacteria. It causes small, red, and sometimes itchy bumps that look like pimples. Common triggers include sweat under a hat or helmet, friction, or products that clog the hair follicles, such as silicones in shampoo. A gentle, sulfate-free and silicone-free routine significantly reduces the risk of folliculitis.
Learn more about an irritated scalp in our guide to an irritated scalp.
Gentle routine for scalp lumps
| Step | What to do | Why |
|---|---|---|
| 1. Switch to fragrance-free shampoo | Sulfate-free, silicone-free | Reduces irritation and clogged hair follicles |
| 2. Wash gently | Use your fingertips, cool water, and no nails | Reduces friction and mechanical irritation |
| 3. Don’t scratch | Avoid pressing, squeezing, or scratching the lumps | Reduces the risk of infection and spreading |
| 4. Avoid wearing tight hats for long periods | Give your scalp regular opportunities to breathe | Friction and sweat can trigger folliculitis |
| 5. Scalp exfoliation | Once a week when the skin isn’t acutely inflamed | Loosens dead skin cells and reduces clogging |
FOAM’s Rice Serenity shampoo bar is fragrance-free, sulfate-free, and silicone-free, making it a gentle choice for a bumpy or irritated scalp. Learn more about how to choose the right one in our guide to shampoo for itchy scalps.
The Editor’s Note: Most scalp lumps are benign and go away with gentle hair care. But a lump that grows, is hard or fixed in place, or remains for more than a few weeks should always be assessed by a doctor.
When should you see a doctor about scalp lumps?
See a doctor if the lump grows, is fixed in place or hard, is painful or warm to the touch, if you have a fever, if it doesn’t go away within four to six weeks, or if you’re unsure what it is. Learn more about sores and irritation in our guide to scalp sores and about scalp flaking.