Back chest neck long a lot of small red bumps, may be eczema, urticaria, folliculitis, ringworm and other factors. It is recommended to pay attention to skin and dietary care, give antihistamine, anti-infection, anti-fungal drugs to regulate. 1. Eczema: the cause of eczema has not been fully clarified, may be a variety of internal and external factors caused by the joint action. It leads to the appearance of pimples and papules with itching. Can be given vitamin C, calcium gluconate, with antihistamines, such as levocetirizine, loratadine and other drugs. 2. Urticaria: The cause of urticaria is difficult to determine, such as food allergy to seafood, intake of fish, shrimp, crab, resulting in the appearance of many small red bumps with itching. Commonly used clinical drugs include cetirizine and promethazine hydrochloride. When the symptoms are severe, dexamethasone or epinephrine can be injected. 3. Folliculitis: Folliculitis is an inflammation caused by bacterial or fungal invasion of hair follicles, which may lead to the appearance of a lot of small red bumps on the chest and back. Treatment of bacterial infection mainly with anti-infective drugs such as erythromycin ointment, fusidic acid ointment, oral amoxicillin, levofloxacin and so on in severe cases; if it is a fungal infection, can be given topical miconazole nitrate, ketoconazole cream, etc., the condition is serious, but also oral itraconazole and so on. 4. Ringworm: ringworm is caused by fungal infection, if it occurs in the chest and back, it may lead to local small red bumps. The main antifungal drugs, such as terbinafine hydrochloride tablets, itraconazole capsules with urea Vitamin E cream and other external treatment. The appearance of many small red bumps on the chest, back and neck is a skin problem, if necessary, go to the hospital dermatology department to find the cause.