The condition of black spots on toes is considered to be related to trauma, fungal infection, melanoma and other factors. 1. Trauma: some patients with black spots on toes, the first consideration is traumatic bleeding, such as in the case of extrusion, stepping on, smashing, etc., which may cause subcutaneous bruising, and then black plaques will be formed, and most of them will be absorbed and subside by themselves. 2. Fungal infection: if the patient has fungal infection in the toe area, it may cause the phenomenon of black spots, mainly in the fungal infection at the same time, this will cause damage to the nail area, causing crushed black spots under the nail. 3. Melanoma: black spots on toes do not exclude the possibility of melanoma, which is mainly due to the malignant transformation of melanin cells and its malignant degree is higher. The phenomenon of black spots on the toes of patients may also have other reasons, so it is recommended to go to regular hospitals and cooperate with specialists to do further examination and treatment, so as not to delay the treatment.