One and a half year old baby head long pus, consider and mosquito bites, eczema, folliculitis, seborrheic dermatitis and other factors. 1. mosquito bites: often in and out of the external environment, mosquito bites may cause itching, scratching induced infection, resulting in localized pustules. 2. Eczema: babies in early childhood are affected by genetics, environment and diet, which may cause eczema-like changes. Eczema causes itching, scratching induces infection and may turn into pustules. 3. Folliculitis: usually do not pay attention to hygiene, scratching leads to skin damage, bacterial invasion leads to hair follicle tissue infection, the formation of purulent folliculitis, resulting in local pustules. 4. seborrheic dermatitis: children with pus on the head, but also to understand whether it is related to seborrheic dermatitis. Seborrheic dermatitis can occur in seborrheic areas, such as the head, face, resulting in localized greasy scales or scabs. Found that the baby head long pus, it is recommended not to self-treatment, to avoid local irritation, you can go to the hospital dermatology department, targeted to give treatment.