Thanks for writing in.
Although difficult to say exactly without examination, it could be hives, which is an allergic condition that can cause itchy bumps on skin. It can occur anywhere on the body such as the trunk, arms, and legs.
Hives are usually allergic (food, cosmetics, medication and insect
; and hepatitis. Many a times no specific cause for them is ever found.
They usually go away on their own, but in a few cases when they last beyond 24 hours or become chronic, medicine might be needed. However, you should consult your doctor for the exact diagnosis and treatment. The itching of hives can usually be rapidly relieved with antihistamines like hydroxyzine or diphenhydramine. Do write in if you need any other information.