The most common diagnosis of yellowish water and crusting on the scalp would be impetigo, commonly known as yellow sores, which is a very common infectious skin disease of Pseudomonas aeruginosa. Characterized by the occurrence of papules, blisters or pustules, which break easily and form yellow pus scabs, it is a contact infection that spreads relatively rapidly and is generally more prevalent among children. Basically, staphylococcal infections are the most common, and the majority of the pathogens are Staphylococcus aureus, followed by Staphylococcus albicans, and to a lesser extent Streptococcus haemolyticus, and mixed infections can also occur. Xanthous ulcer is generally popular in summer and fall, with the highest incidence of sweaty, hot weather, usually 2-7 years old children are more common. Treatment begins with attention to personal hygiene, keeping the skin clean, and timely treatment of various skin diseases. Patients should be isolated, used clothes, towels and personal utensils, should be sterilized, in general give antibacterial treatment, internal can be oral antibiotics, topical neomycin ointment or mupirocin ointment, glycerite lotion and so on.