Did med cause skin condition?

DEAR DR. GOTT: While in Vietnam, I was taking a dapsone pill daily, as the Army suggested. Unknown to me, I had an allergy to the pill and became methemoglobinemic. I stopped taking the pill, but still have lichen planus on my legs and buttocks that comes and goes. I can go weeks with no trouble, then I have a breakout that will last for up to a month before clearing. I read that the dapsone could be the cause of the onset of the lichen planus. Can you tell me if this is right or wrong? Where can I find more information?

DEAR READER: Dapsone is commonly prescribed to treat dermatitis, herpetiformis (a skin condition that commonly appears on the elbows and knees), acne, infection and more.
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