<prompt> Dapsone is used in -Dermatitis herpetiformisPityriasis rosaceaContact dermatitisOculocutaneous albinism  <response>: Ans. is a i.e., Dermatitis herpetiformis Dermatologic conditions in which dapsone is used:Dermatitis herpetiformisErythema elevatum diutinumPemphigusPemphigoidBullous lupus erythematosusAdverse effects of dapsoneo The most common adverse effect of dapsone is hemolytic anaemia Patients with G-6-PP deficiency are more susceptible.o Second most common adverse effect is methemoglobinemia.o Other side effects are - Nausea, anorexia, headache, paresthesia, drug fever, mental symptoms, rashes, fixed drug eruption, hypermelanosis Pigmentation, phototoxicity, exfoliative dermatitis, hepatitis, agranulocytosis, lepra reaction and sulfone syndrome, infectious mononucleosis like syndrome. 