basal cell carcinoma
"I'm in my third week of Imiquimod applying to 5 bcc's on arms, forehead and back 5 days a week.  At this point 3 of them are very red and crusty and sort of beginning to scale or sluff off which I think is good.  Two of them aren't responding at all -- I'm sort of puzzled about that. The one on the forehead which had been a pale color is now bright red; hopefully it will crust up and sluff off soon.  The side effects are awful the first few days after beginning the 5-day course of treatment -- really terrible joint and muscle aches and headache.  I almost wanted to stop treatment, but remembered how many surgeries I would have to have and so decided to "tough it out" as  I've already had approx. 20 skin cancers removed surgically."