Skin allergies red itchy particles, usually refers to urticaria caused by contact dermatitis, should be immediately detached from the allergen, and then according to the different diseases to choose the appropriate drug treatment. 1. urticaria: can be caused by food, drugs, respiratory tract inhalation and skin contact, manifested by the size of the red red masses with itching, should immediately stop contact with the allergenic substances, can be used externally with glycerite lotion, oral antihistamine drugs such as loratadine treatment. 2. Contact dermatitis: contact dermatitis is due to contact with certain exogenous substances, in the skin and mucous membrane contact sites occurring acute or chronic inflammatory reaction, can be manifested as erythema papules with itching and other symptoms. It should be quickly detached from the sensitizer and clean the skin, topical glucocorticosteroids such as Dinaid cream, oral loratadine and other antihistamine medication. Skin allergies, red itchy particles, there may be other reasons, it is recommended that timely to the hospital, under the guidance of the doctor to use medication.