Hi just been diagnosed with leukocytoclastic vasculitus following a skin biopsy. Dermatologist want to start me on 25mg of dapsone for 4 weeks and then if no improvement then go onto 50mg. Has anyone else used this drug and does it work? how long does it take for the rash to go and does it ever come back? I've been on bed rest for 3 months because as soon as I'm on my feet the rash starts and when I rest it goes. It's like a vicious circle. I am 47.