I'm 15 and had a hurt left testicle and was prescribed Sulfameth. I took two tablets a day for ten days. On day ten, I started to get red spots on my arms and chest, then around other areas of my body. Right now I'm going to try Benadryl to alleviate the itchiness. At least my testicular pain is gone, and I have a week off of school to let the spots go away.