What causes keratosis pilaris?
Keratosis pilaris is caused by the build-up of a skin protein called keratin. Excess keratin can block hair follicles or pores in the skin, forming small, hard bumps. The reason for the build-up of keratin is unknown, but it often occurs alongside other skin conditions, such as dermatitis, and may be a genetic condition.
Keratosis pilaris signs and symptoms
Keratosis pilaris usually results in small, hard, flesh-coloured or white lumps, which can have an acne-like or rough appearance. The bumps, which can pepper the skin, are commonly found on areas of dry skin on the upper arms, thighs, chest and, sometimes, the face. The condition doesn't usually cause any pain. You may find affected skin becomes sandpaper-like. If the bumps cause itching or irritation, they may become red and slightly inflamed and cause scarring.
Keratosis pilaris diagnosis and treatment
There are no tests for keratosis pilaris. Instead diagnosis is usually made after examining the skin. Keratosis pilaris is often a mild condition that doesn't require medical treatment and eventually disappears in early adulthood.
Below are a number of self-care regimens that may help to reduce symptoms:
- Try not to scratch the bumps.
- Treat your skin gently and avoid using harsh chemicals, which can dry out your skin.
- Wash using a mild soap and warm, rather than hot, water.
- Gently pat or blot your skin dry and follow up by applying a soothing moisturising cream that contains lanolin, petroleum jelly or glycerine.
A variety of medicated creams, some of which are available over the counter, may also help to relieve symptoms. The creams contain ingredients, such as retinoids (vitamin A), urea, alpha-hydroxy acid, lactic acid or salicylic acid, that help to break down the excess keratin and remove dead skin. However, these chemicals can be harsh and cause dry skin and irritation, so they may not be suitable for children.
Laser therapy can be used to successfully treat keratoris pilaris that has become very red and inflamed.
For more information on treatment options, or if symptoms are causing you or your child anxiety or discomfort, talk to your doctor.
Last reviewed: May 2015