Dapsone, British Association of Dermatologists, Updated May 2020.
"Dapsone is a sulphonamide antibiotic. It is available only on prescription. It acts as an anti-inflammatory drug and has been used successfully as a treatment for several skin conditions such as dermatitis herpetiformis, pyoderma gangrenosum, SWEET'S SYNDROME and vasculitis for many years." bad.org.uk/patient-informat...
Additional info: Dapsone, DermNet NZ dermnetnz.org/topics/dapsone/