Black birthmarks with ingrown hairs can be surgically removed. Hairy black birthmarks are usually caused by the patient’s hyperactive melanocytes, such as nevus nigra and Beck’s nevus. 1. Nevus nigra: nevus nigra is a kind of congenital nevus cell nevus, which can appear when the patient is born, and some of them grow hair. There are also large nevi, commonly known as nevus of animal skin, which can be surgically removed. 2. Baker’s nevus: Baker’s nevus is mostly seen in adolescents, and it occurs in the shoulder neck, shoulder blade and forehead, which affects the aesthetics very much, and it is related to genetic mutation and hereditary factors, and it can be excised through surgery. For patients who have black birthmarks with long hair, it is recommended to go to regular hospitals for surgical excision treatment to prevent adverse consequences.