Keratosis Pilaris

This photo of the arm of a 17 year old girl showing tiny red rough bumps that were not painful or itchy.  She had similar bumps on her thighs.  This common condition is called Keratosis Pilaris and it peaks during adolescence in all races.  It goes away by itself as a person ages.

We don't know the cause of this strange phenomenon.  Since it is mainly seen in puberty there may be a hormonal