There could be several causes for these fluid filled bumps such as hives, insect bites
, dermatitis or any allergic reaction. It would be difficult to assess without having a look at the lesions.
Hives or urticaria is a common skin condition, which causes red and sometimes itchy bumps on your skin. Hives can occur anywhere on the body such as the trunk, arms, and legs. Hives are usually allergic (food, medication and insect stings) but may also be due to infections and stress.