<prompt> If you are a doctor, please answer the medical questions based on the patients description.I had an allergy test yesterday. The scratch test, which consisted of dipping a multipronged plastic device into the allergins and then pushed hard on my forearm, produced large welts on my arm and allergy was noted. I was given reactin at the time. The swelling and redness has continued and worsened since yesterday. I went to a walkin clinic and was prescribed a steroid topical and benedrl which I have used since last night. The redness and swelling have increased and the itching is unbearable. Might this be an infection? The technician was new, I was her first ever patient! Thank you for your help!  <response>: These are TH allergens we inject in body you are exposed to large number of allergens and if you have many allergies the condition become like this it takes 3 weeks to subside allergy when exposed to allergen to which you are you start with doxycycline 100 mg BD for 5 days to counter infection if any continue local application as many times as you want start with antiallergic fexofenadine 120 mg BD for 2 waif not controlled take short house and taper it of oral steroidsdont worry it happens in many cases 