Why do hives on my face turn into pimples?

Acne Causes. Hives are welts on the skin that often itch. These welts can appear on any part of the skin. Hives vary in size from as small as a pen tip to as large as a dinner plate. They may connect to form even larger welts. Hives do not turn into acne. Acne can be caused by stress, diet, genetics, hormones, oral medications, and topical preparations.
Maybe not hives. Hives or urticaria when they resolve should return your skin to normal. There should not be pimples or acne that follows. If there is pimples, then a different trigger should be evaluated for. A serious form of hives called urticarial vasculitis could leave bruises on the skin.