Keratosis pilaris is common on the upper arms and thighs. It can extend to the forearms and lower legs. This benign skin condition results from a buildup of keratin, a hair protein, in the pores.

President Donald Trump's latest medical report confirmed the discovery of actinic keratosis-benign but potentially dangerous ...

“We observed reduced unnecessary biopsies, which was driven by benign and premalignant, particularly actinic keratosis, lesions,” Phillipps said. “We observed improved malignancy ...