Yellow crusts on the head of infants are considered to be caused by infantile eczema and seborrheic dermatitis. Infantile eczema is a kind of allergic skin disease caused by genes and environmental factors. It occurs in infants 2-3 months old and usually manifests itself as symmetrical erythema, papules, pimples, oozing and other lesions on the head and face, which will gradually increase with the development of the disease, and visible blisters and yellowish-white scales and scabs will appear, accompanied by obvious itching sensation. Currently there is no complete cure for infantile eczema means, mainly through the use of drugs to alleviate the improvement of clinical symptoms, and the need to remove the triggering factors in a timely manner, to avoid infants contact with or intake of suspected allergenic substances, in the acute stage of the onset of the onset of the use of boric acid solution or saline cold compresses under the supervision of a doctor, but need to pay attention to do not blindly use the drug, to avoid the adverse effects. Seborrheic dermatitis can also be manifested as yellow crusts on the head, can also be seen in erythema, flaking and other lesions, with the development of the disease, the involvement of the site will increase, can be accompanied by itching. Attention can be paid to clean, topical mometasone furoate ointment and so on. Drugs are used in accordance with the doctor’s instructions.