Black spots inside the hair may be caused by hyperpigmentation, subcutaneous bruising or seborrheic keratosis.
1. Hyperpigmentation: if the hair is often dyed, the melanin contained in the dye and sweat will fuse and penetrate into the surface of the skin, which may lead to the appearance of black spots in the hair.
2. Subcutaneous bruise: If the patient’s head is accidentally traumatized and there is bruise, if the bruise is not dissipated in time and the local blood circulation is not smooth, it may also lead to black spots in the hair.
3. Seborrheic keratosis: the cause of seborrheic keratosis is not clear at present, it may be related to heredity, ultraviolet radiation, viral infection and other factors.
Black spots in the hair may also be caused by other reasons, it is recommended to actively go to the regular hospital for relevant examinations, a clear diagnosis, follow the doctor’s instructions for targeted treatment.