Duration | Skin rash on lower leg

Duration

The duration of a rash depends strongly on the cause and whether a sufficient therapy is initiated or is available. For example, an allergic rash can heal within about two weeks if the triggering agent is identified and avoided. Congestive dermatitis, however, will remain until the venous insufficiency has been eliminated. Other rashes, such as the erythema migrans of Lyme disease, may heal spontaneously, although the cause is not eliminated.