If you have a sudden red bump on your body, you need to carefully observe the appearance of the red bump. If the red bumps are flat and raised, accompanied by intense itching, it may be acute urticaria, which is directly related to allergies and is a swelling-like change that occurs when allergic factors act on the skin surface, resulting in the local degranulation of mast cells and the accumulation of cell contents under the skin. It is recommended that topical application of glyburide lotion together with oral administration of Epstein tablets will make the red bumps subside. If the red bumps grow out with papule-like changes and have obvious bumps when touched by hand, it is considered to be acute allergic dermatitis. For skin-specific changes caused by exposure to certain allergic substances, topical application of fluticasone propionate cream or denuded cream is recommended.