Hard to tell from the pictures, but possibly hives. Hives produce welts that come and go randomly, as you say your bumps do. Most of the time, they are not caused by anything specific. Treatment consists of antihistamines (OTC ones include Benadryl, Claritin, Zyrtec, or their generics) and topical anti-itch creams (Caladryl, Sarna.) For definitive diagnosis, though, you'll need to see a doctor in person.
Best.
Dr. Rockoff
also the only thing i have tried for it so far is
1% hydeocortisone, didnt help obviously