For the black pigment left behind by ringworm, usually belongs to the post-inflammatory hyperpigmentation, can take temporary observation, topical medication, oral medication, laser treatment and other ways to relieve. 1. Temporary observation: For post-inflammatory hyperpigmentation, if the degree of hyperpigmentation is mild, most of it will subside on its own, and generally no special treatment is needed, so it can be temporarily observed, and sun protection can be done. 2. Topical medication: patients can use hydroquinone cream, cumquat ointment and other drugs to inhibit the proliferation of melanocytes, so that hyperpigmentation is reduced. 3. Oral medication: Tranexamic acid, vitamin C, and reduced glutathione can be taken orally to inhibit inflammatory reactions and melanin formation, and to promote the repair of the skin barrier. 4. Laser treatment: local laser treatment, such as picoseconds, can selectively target and destroy the precipitated melanin, so as to lighten the local pigmentation. It is recommended that patients can go to the dermatology department of the hospital, under the guidance of a professional doctor, to carry out the appropriate treatment and therapy, not blindly use drugs.