Hi Charlene,   If you told the dermatologist that you were allergic to sulfur and were prescribed an ointment that contained a sulfur derivative, that says very loudly to me that the doctors and staff WERE NOT LISTENING to you and therefore should NOT be trusted to give you any more medical advice.  So, after reporting to that doctor what his nurse said ("you're not going to die!"), which is inexcusable, I would immediately seek out another dermatologist and have your mole diagnosed again.  Suspicious mole's are nothing to mess around.  If you don't know of another dermatologist, ask your internist for a recommendation or, better yet, ask your friends who they use and like.  Word of mouth has always worked best for me.  Good luck and PLEASE do not wait to see if the mole gets better on it's own.  It needs PROPER medical diagnosis and attention ASAP.