Use of at least one transaminase inhibitor for the preparation of an agent for the prophylaxis and therapy of pityriasis versicolor (pityriasis), characterized in that the transaminase inhibitor is aminooxyacetate, cycloserine or the cycloserine derivative, namely terizidone.Uso de al menos un inhibidor de transaminasas para la preparación de un agente para la profilaxis y la terapia de pitiriasis versicolor (pitiriasis), caracterizado porque el inhibidor de transaminasas es aminooxiacetato, cicloserina o el derivado de cicloserina, concretamente terizidona.