I've been to dermatologist for five years now, tried different things some worked others didn't. Starting sometime last year my chest acne got really bad, and I went to the dermatologist to get it fixed. It's been two weeks since I've been prescribed Aczone(twice a day) and Ziana(only at night time.) I know that there is a 'purge' phase or something, but I'm pretty sure my reaction isn't typical. My shoulders and neck have broken out in a rash/hive dilemma. It's painful and I don't know if it's getting better. My face is also starting to break out in a rash on the sides of my forehead. I will keep updating every week or so. If this rash doesn't get better by next week, I will for sure go see the derm.