For the past 2-3 years I have been getting recurrent sore throas ts and sinus infections requiring antibiotics everytime. Approx 4 x year, with sometimes several recurrent bouts requiring different antibiotics. I also have noticed everytime i get sick I also get a itchy rash on inside of my elbows. It starts off a red bumps, similar to heat rash becomes very itchy and then turns thick and patchy and becomes scaly and flaky in appearnace, which resolves with anitbiotics. What is this?