Bullous pemphigoid and psoriasis: does subclinical bullous pemphigoid exist?

Abstract
Four cases are presented in which probable bullous pemphigoid and probable psoriasis co-existed. One case represents a simple coincidence of the 2 diseases. In the other 3 cases, the bullous lesions were transient and seemed to be induced by elements of the Groeckerman regimen. These 3 cases may represent a subclinical form of bullous pemphigoid induced by the irritant effects of coal tar, UV light, the reduced barrier function of a pre-existing dermatosis or a combination of these factors.