Suggest Medication For Dermititis

I recently had a kidney infection and was given Augmentin for. I took it for only 3 days and a month (March 2011) later developed a Prostate infectiona and given Cipro for 30 days. I then got a sinus infection the middle of April 2011. Last week I had joint pain and now have a rash on both legs. I went to the dr. and got doxycycline and prednisone. They diagnosed me with dermititis. The rash got worse this past weekend possibly associated with alcohol consumption or exposure to the sun. I am wondering what this is? is everything related?