The common factors for babies with so many small bumps on their legs are eczema, papular urticaria or mosquito bites. Reasons for different treatment methods are not the same, should be timely consultation, specific analysis is as follows: 1. Eczema: in addition to the growth of small bumps, can also be seen papules, blisters, vesicles, scratches, scabs and other polymorphic rashes, and accompanied by a certain sense of itching. The treatment can follow the doctor’s advice to apply a weak glucocorticoid cream such as Dinaid cream. 2. Papular urticaria: It is a common allergic skin disease in infants and children. Treatment can choose oral loratadine or levocetirizine hydrochloride drops, topical glycerite lotion, and avoid allergens. Avoid washing the affected area with hot water during treatment to avoid aggravating the condition, and the medication should be prescribed by the doctor, do not blindly use drugs. 3. Mosquito bites: when the baby was mosquito bites will also appear in the local pimples, generally no special medication, you can follow the doctor’s instructions to apply glycerine lotion to relieve the itching symptoms. When the baby legs a lot of small bumps, it is recommended to take the baby to the hospital in a timely manner, under the guidance of the doctor’s medication.