<unk>  (CU) presents with tiny very itchy wheals and small bumps on a reddish background. It is a type of physical<unk>  (or hives) that appears when a person is sweating or their core body temperature increases.
Cholinergic urticaria
Adrenergic urticaria
Solar urticaria
Aquagenic urticaria
Pressure urticaria
Cold urticaria
Physical urticaria
Heat urticaria