Topical tacrolimus for the treatment of localized, idiopathic, newly diagnosed pyoderma gangrenosum.

Pyoderma gangrenosum (PG) is a rare neutrophilic dermatosis which may present in a classic ulcerative form or in atypical bullous, vegetative or pustular variants. It can be associated with several disorders or be idiopathic. Although systemic immunosuppressants remain the choice therapy for most cases of PG, a local approach should be considered in localized disease. Recently, topical tacrolimus has successfully been used as an off-label drug in localized PG. In the present study, five patients with localized, idiopathic, newly diagnosed PG were treated with topical tacrolimus monotherapy. Localized PG was defined as disease involving no more than 5% of the body surface area and presenting with no more than three lesions. Cultures performed on PG lesions both before and during tacrolimus treatment were negative. In all five patients complete remission was achieved within a mean time of 6 weeks and no relapses occurred; in three cases, tacrolimus was discontinued, while the remaining two patients were applying the drug as maintenance therapy at the time of writing. Thus, we suggest that topical tacrolimus monotherapy could represent the first-line treatment for PG that fulfils the following criteria: localized disease, idiopathic form and recent onset with negative microbiological tests on PG lesions.