Psoriasis is a dermal condition that prompts flaky skin patches which develop scales. It is a chronic autoimmune condition that causes skin cells to grow too quickly. This results in the buildup of thick, scaly patches on the skin. Psoriasis can occur on any part of the body but is most commonly found on the elbows, knees, and scalp. On all skin colors, the patches can appear pink or red, and the scales can look white or silver. On brown and black skin, the patches can also look purple or dark brown, and the scales may look grey.