Suggest Treatment For Pink Rash On Face And Neck After Antibiotic Dose

1month back my 5yr old daughter started coughing. Pediatrician prescribed Broomfied and other cough related medicines. It did not provide enough relief. So, doc gave amoxicillin for a 10 day course (7.5ml X2 times a day) and albitrol. As soon as the antibiotic dose is over, she started to have skin rashes on all over her body especially on joints, neck,face with swollen rashes and the cough worsened.Then we visited an allergy specialist and he immed gave prednisolone (3day course) along with ADVAIR and asked to use Albitrol only in worse situation. We are also continuing Benadryl or other OTC allergy medications. Though the severeness of cough and rashes reduced, we still see the rashes on her face,neck and scalp. It worries us that we were not able to identify the root cause why this rash is happening and allergy doctor is doing all types of environmental,food and other tests.Rash:Its pink in color, comes out mostly as long lines on face, with white bump in middle and pink around. It itches a little bit (not a whole lot, no burning) and it disappears in few mins without any needed action.My question to the Pediatrician here is what is this Rash called,what is it caused by and any possible treatment. Any possible help on this is very much appreciated from bottom of our hearts.