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 present determine whether gentle hair care is sufficient or whether you should see a doctor.
It is easy to become worried when you feel lumps on your scalp. Most are benign and are so-called epidermal cysts or follicular inflammation, and respond to gentle hair care. However, some lumps should be assessed by a doctor.
Read more about scalp health in our complete guide to scalp health.
Common causes of lumps on the scalp
| Type | What it feels like | Common cause |
|---|---|---|
| Folliculitis | Small, red, tender lumps 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 lumps | Raised red patches with silvery-white scales | Autoimmune disease |
| Contact eczema | Small itchy, reddened lumps | Allergy to fragrance, sulfates, or hair dye |
| Slight raised lump (lipoma) | Soft, movable lump that grows slowly, painless | Benign fatty tissue growth |
Read more about rashes and redness in our guide to scalp rashes and about scalp psoriasis.
Folliculitis on the scalp: the most common cause
Folliculitis is inflammation of the hair follicle, usually caused by bacteria. It causes small, red, and sometimes itchy lumps that resemble 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.
Read more about an irritated scalp in our guide to irritated scalps.
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 fingernails | Reduces friction and mechanical irritation |
| 3. Do not scratch | Avoid pressing, squeezing, or scratching the lumps | Reduces the risk of infection and spreading |
| 4. Avoid wearing tight hats for long periods | Air out your scalp regularly | Friction and sweat trigger folliculitis |
| 5. Scalp exfoliation | Once a week when the skin is not 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 lumpy or irritated scalp. Read more about how to choose the right one in our guide to shampoo for itchy scalps.
The Editor’s Note: Most lumps on the scalp are benign and disappear with gentle hair care. However, a lump that grows, is hard, 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 does not disappear within four to six weeks, or if you are unsure what it is. Read more about sores and irritation in our guide to scalp sores and about scalp flaking.