Keratosis pilaris is a common, harmless skin condition. It causes small, hard bumps that may make your skin feel like sandpaper. The bumps are often light-colored. They usually appear on your upper arms, thighs, and buttocks, sometimes with redness or swelling. They can also show up on your face, but that's less common.. Keratosis pilaris most often affects the outer aspect of both upper arms. It may also occur on the thighs, buttocks and sides of the cheeks, and less often on the forearms and upper back. The It may also occur on the thighs, buttocks and sides of the cheeks, and less often on the forearms and upper back.. eligibility to win from this notice! $7,000.00 a week for life authorizrd for award from pch.gwy.no.13000! a lifetime prize absolutely yes yes i want to be selected the winner from this pink ticket notice and i confirm my aspiration to be selected the winner the winn from this notice!. Keratosis & Magnesium. Keratosis pilaris is a common skin condition characterized by small acne-like bumps and dry, rough patches. Your arms, buttocks and thighs are most likely to be affected. The basic cause of keratosis pilaris is a buildup of the protein keratin that blocks the skin's hair follicles.. Chicken skin, officially known as keratosis pilaris, is a very common, harmless, genetic condition that causes small, hard, skin colored to reddish bumps, most often on the back of the arms.. Keratosis pilaris is a very common condition. By my best estimate, at least 15% of American teenagers and adults suffer from it. Fortunately it doesn’t entail any significant health damage, but it can be a nuisance, especially if you are picky about the way that your skin looks..