Over The Last 2 Months I Have Had Many Boils

over the last 2 months I have had many boils pop up under my arm very painful and large after a cause of antibiotics I am still having a problem and have been put back on antibiotics which really don't agree with me. I have a healthy diet and a very clean person never had a problem in the past is there a blood test I can have to find out why this has happened.