Scab (seborrheic dermatitis) is a rough, flaky, seborrheic scab that appears on an infant’s scalp. It is a non-infectious disease that is caused by a high secretion of sebaceous glands and usually begins to occur when the child is a few weeks old and disappears after a few weeks or months, rarely causing discomfort and itching to the child. The scalp can be washed away the scabs. and control the progression of this disease.