The sudden growth of bumps like mosquito bites, super itchy, is usually associated with factors such as urticaria and contact dermatitis. Patients are advised to clarify the cause and treat it through oral medication as well as topical topical medication. Common causes and treatments: 1, urticaria: patients in contact with allergic factors, the body appears red or skin-colored wind, usually accompanied by intense itching, can be treated by internal antihistamines, or topical glucocorticoids, to play the effect of anti-inflammatory and anti-itch; 2, contact dermatitis: the patient’s skin contact with irritants, resulting in a local rash, itching and even accompanied by fever symptoms. Available saline, light soapy water, as soon as possible to rinse, remove the irritants remaining on the skin surface, if necessary, internal antihistamines, sulfonamides. Precautions: Patients should avoid hot water to scald the corresponding skin, and avoid strong sunlight or hot and cold stimulation. Usually reduce local stimulation and do not scratch at will to avoid aggravating the discomfort.