A bald patch on the top of the head may be related to baldness, androgenetic alopecia, seborrheic dermatitis and other diseases.
1. Pemphigus vulgaris: the cause of the disease may be related to abnormal immune mechanism, heredity and other factors, and mental factors, infections and other reasons may also induce the disease. Patients will have oval or round hair loss area on the head, and the hair on the edge of the hair loss area is loose and easy to pull out.
2. Androgenetic alopecia: the cause of the disease may be related to genetic factors, androgen and other factors. Clinical manifestations include gradual thinning and loss of hair at the top of the head.
3. Seborrheic dermatitis: the etiology is still unclear, and may be related to immune response, Malassezia infection, heredity and other factors. Patients will have localized hair thinning and loss, accompanied by erythema, scales and other symptoms.
The top of the head will be bald a piece of the reason is more, it is recommended that the patient timely to the regular hospital, clear cause, under the guidance of the doctor targeted treatment.