Recently took Bactrim DS for a skin infesction on my face. It helped clear up the infection on my face, but the next day i had 3 sores on my penis. I finished the course of the Bactrim, the sores did not go away. Approximately one week after taking the medication, i went back to the Dr to get the sores checked out out. She then prescribed more Bactrim. The next morning i woke up, i had severe blister type boils that resembled herpes. I was tested, it was not herpes. Is this an allergic reaction to the Bactrim. My Dr isnt even sure...