In a nutshell
Many small rough bumps can appear on the upper arms or thighs and resemble permanent goosebumps. Keratosis pilaris often begins in childhood or adolescence and may be more noticeable when the skin is dry. It is not contagious.
Why does it happen?
Keratin collects in the upper part of the hair follicles instead of being shed inconspicuously. The exact cause is not fully understood; predisposition and properties of the skin barrier play a role.
Frequency
Keratosis pilaris is a common skin condition, especially in children and young adults. Its severity and visibility can fluctuate over time.
Frequency is a qualitative description, not your individual probability.
Is it normal?
Typical, stable keratosis pilaris is harmless.
When to seek advice
Painful, pus-filled, or rapidly appearing bumps may be something else and should be assessed.
Does this happen to you?
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Sources (1)
- DermNet: keratosis pilaris (opens a new tab)
This source supports the description and physiological context of this entry.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
