What should I do if I have acne?

1, this is acute urticaria. The onset is urgent, the skin suddenly itches, and soon red air masses of different sizes appear, which are round, oval or irregular, and begin to be isolated or scattered, gradually expanding and merging into blocks. The rash may be orange peel. After a few minutes or hours, the edema is relieved, and the wind mass becomes erythema and gradually disappears. Generally speaking, the duration of wind masses does not exceed 24 hours, but new wind masses appear one after another. 2. Generally speaking, urticaria is caused by the following reasons: (1) allergic to allergens (this is the most important-including drugs, food, external environmental contact, etc. ); (2) Acute infectious diseases (such as acute tonsillitis and infection caused by trauma). ) or chronic inflammation (such as dental caries, gynecological chronic inflammation, etc. ); (3) organic diseases