The time course of topical PUVA erythema following 15- and 5-minute methoxsalen immersion.

Background: Limited data exist in the literature concerning the characteristics of erythema following psoralen UV-A (PUVA) treatment using topical methoxsalen. To optimize the phototherapeutic regimen and reduce short- and long-term risks, knowledge of such basic information is essential.

Observations: The characteristics of PUVA erythema following 15- and 5-minute immersion in methoxsalen was determined.