Yellow crusts on the head may be due to impetigo, folliculitis, tinea capitis or seborrheic dermatitis. 1. impetigo: commonly known as yellow sores, is a skin disease caused by Staphylococcus aureus, type B hemolytic streptococcus infection, localized pimples, pustules and other lesions, prone to breakage, the formation of yellow scabs. 2. Folliculitis: due to bacterial or fungal infection, suppurative folliculitis occurs on the scalp, and yellow crusts can be formed after the pus breaks out. 3. Tinea capitis: fungal infection of the scalp, local itching, vesicles, followed by the formation of yellow scabs. 4. Seborrheic dermatitis: seborrheic dermatitis of the scalp, locally visible yellow-red patches, adhering to greasy dandruff, usually accompanied by obvious itching. Yellow crusts on the head, pay attention to keep local clean, avoid picking off the scabs, and timely medical care, clear cause of the treatment as prescribed by the doctor, do not blindly use their own medication.