Cystic fibrosis (CF) is a genetic disorder characterized by the production of sweat with a high salt content and mucus secretions with an abnormal viscosity.

An inflammatory process in skin caused by an exogenous agent that directly or indirectly injure the skin. If the offending agent is identified and removed, the eruption will resolve. An unusual or patterned eruption may be a clue to the presence of a contact dermatitis. Patch testing may be helpful in the differential diagnosis.