I recently was given a 10-day dose of Bactrim DS for an infected abscess from a sebaceous cyst. On day 7, I began a low grade fever. My doctor wasn't concerned and suggested I continue to take it. Yesterday (day 9), I noticed a rash beginning on my arm, and called the doctor to advise and update. He asked to see me, and by the time I got there (2 HOURS later), it had spread to my entire body, save my genitals and head. He still was very non chalant, given the potentially fatal side effects. After 1 dose of prednisone, while the rash has seemingly faded in color, it seems more dense. Is this a normal allergic reaction or something more? Knowing that my doc has seen it (even though I didn't share my concerns about SJS), and I being unduly nervous?