The most common sebaceous disorders are acne and keratosis pilaris
, which presents as tiny, hard bumps on the skin. What causes keratosis pilaris
is a build up of the protein keratin. It can form plugs in hair follicles, resulting in the skin’s bumpy appearance. Often there is no identifiable reason why people get the condition, though in some cases, if your parents had it, you’re more genetically inclined to have it too.