KP is characterized by a patchy or scattered rash that creates a rough and bumpy texture to the skin. These bumps are caused by the accumulation of excessive amounts of keratin around individual hair follicles. Your skincare expert at Midwest Dermatology can typically provide you with a diagnosis of keratosis based on the appearance of your skin. If you are an adult who has developed KP for the first time, your dermatologist may ask you questions about any new medications you are taking, as this may be the case of your condition. Most people who develop keratosis pilaris will do so in childhood or adolescence. While it is possible to develop KP as an adult, this is very rare, and it is more likely to be a side effect of a prescription medication taken for another reason.