Hello,
From the symptoms it looks like hives or urticaria rather than acne. You can take some antihistaminic like benadryl or Claritin. You may also need topical and oral steroids which are available under prescription. Also wear cotton clothes. If the symptoms persist then it will be best to get it evaluated from a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
http://i.imgur.com/ZQBYv.jpg