Keratosis pilaris (ker-uh-TOE-sis pih-LAIR-is) is a common, harmless skin condition that causes dry, rough patches and tiny bumps, often on the upper arms, thighs, cheeks or buttocks. The bumps usually don’t hurt or itch.
Keratosis pilaris is often considered a variant of normal skin. It can’t be cured or prevented. But you can treat it with moisturizers and prescription creams to help improve the appearance of the skin. The condition usually disappears by age 30.
Keratosis pilari can occur at any age, but it’s more common in young children. Signs and symptoms include:
- Painless tiny bumps, typically on the upper arms, thighs, cheeks or buttocks
- Dry, rough skin in the areas with bumps
- Worsening when seasonal changes cause low humidity and dry skin
- Sandpaper-like bumps resembling goose flesh
When to see a doctor
Treatment for keratosis pilaris usually isn’t necessary. But if you’re concerned about your or your child’s skin, consult your family doctor or a specialist in skin conditions (dermatologist).
Keratosis pilaris is caused by the buildup of keratin — a hard protein that protects skin from harmful substances and infection. The keratin blocks the opening of hair follicles, causing patches of rough, bumpy skin.
It’s not clear why keratin builds up in people with keratosis pilari. It may occur in association with a genetic disease or with skin conditions such as atopic dermatitis. Dry skin tends to make keratosis pilari worse.
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