The melanin left behind after ringworm growth, also known as post-inflammatory hyperpigmentation, can be relieved by patients through medication intervention, chemical peeling, and laser treatment. 1. Pharmacological intervention: patients can use hydroquinone cream or azelaic acid as prescribed by the doctor to lighten the hyperpigmentation left after ringworm. 2. Chemical exfoliation: patients can apply exfoliators to the melanin areas of the skin, such as salicylic acid and fruit acid, etc. Through the action of chemical substances on the surface layer of the skin, they can cause controllable damage to the skin at different levels, so that the epidermal melanin is shed and gradually replaced by newly grown epidermis, which can promote the reconstruction of the skin and lighten the hyperpigmentation. 3. Laser treatment: patients can directly act on the melanin under the skin through laser treatment, which is conducive to the fading of melanin through photothermal effect. For the melanin left after long ringworm, patients should go to regular hospitals, cooperate with doctors to give standardized treatment to improve the local appearance.