Dear, welcome on HMC, Rashes may also be associated with skin conditions, such as eczema, psoriasis and impetigo. The elbow is a common location for psoriasis eruptions, which cause scaly white spots and inflammation. Some chronic skin conditions may flare up for a time, then resolve. Other causes of rash include autoimmune disorders that occur when the body is attacked by its own immune system, which normally serves to protect it from foreign invaders (antigens) and can be treated with medications, including over thecounter creams and ointments containing the steroid hydrocortisone (for example, Cortizone-10, Cort-Aid..