The increasing number of melanin spots on the scrotum may be due to intradermal nevus, melanoma, or hemangioma, fungal infection, etc. It is recommended to go to the hospital for examination and treatment. It is recommended to go to the hospital in time for relevant examination, to clarify the cause, and then give treatment.1, intradermal nevus: when the scrotum localized pigmentation increases, intradermal nevus can be formed, which manifests itself as more and more scrotal melanin spots. Intradermal nevus is usually not higher than the skin surface, and is not accompanied by local redness, swelling, pain and other phenomena. Clinical observation can be carried out, and local laser removal can also be considered. If it increases in a short time, medical intervention is needed; 2. Melanoma: If melanoma appears in the scrotum, it can cause more and more scrotal melanotic spots due to malignant transformation of local melanocytes. Melanoma is generally significantly higher than the skin surface, and accompanied by local redness, gradual increase in the number of skin, obvious pain and other symptoms. Local biopsy is needed to make a clear diagnosis and then expand the excision surgery; 3, vascular nevus: patients with vascular nevus can be due to the abnormal proliferation of vascular endothelial cells, resulting in higher than the surface of the skin raised black blood vessel-like bulge, which can be manifested as more and more scrotal melanotic spots. Generally there is no obvious pain, after excessive friction, it may be localized redness, or even ulceration and bleeding. At this time, we can consider laser or surgical excision treatment, during the treatment need to ensure balanced nutrition, avoid eating spicy, stimulating food; 4, scrotal fungal infection: if the local care is not appropriate to lead to scrotal fungal infection, can also be due to the massive reproduction of the fungus, and the scrotal skin color black, often accompanied by thickening of the skin, flaking and other phenomena, but also accompanied by itchy, which can be manifested as the scrotal melanin spots are getting more and more. At this time need to carry out fungal culture or smear examination, after the diagnosis of fungi, need to use topical antifungal ointment treatment, such as clotrimazole ointment, miconazole ointment. In addition, life should try to wear loose underwear, and do not sit for a long time, hold urine, wash the vulva diligently, keep the local clean and dry, avoid unclean sexual contact, is conducive to reducing the situation.