Could be that they are mosquito bites. In any case, you can try Sarna lotion or Sarna Sensitive lotion--both available over-the-counter, and apply them as needed. Over-the-counter antihistamines worth considering are loratadine (Claritin), cetirizine (Zyrtec) and chlortrimeton. If they're not bites, I'd only be guessing at what caused them, because I can't think of anything else. You'll need to show them to a doctor if they don't go away.
Take care.
Dr. Rockoff