I was prescribed Bactrim for an ear infection. A few days after taking it my lymph nodes in my neck became terribly painful and swollen. On the 8th day of the meds I have developed a rash on my arms, chest and face. I returned to the doctor today. He said that the rash is just a heat rash, and that the lymph nodes are just infected and prescribed another antibiotic! I spoke to my mother and sister and they are both very allergic to Sulpher based antibiotics. It looks like I am too. Glad that I read the post. I will never take that med again. I am nervous to stop the med at day 11 when I was prescribed for 14 days but I can't take these side effects any longer.