The duration of melanoma development varies because melanoma is a type of skin cancer with a relatively high degree of malignancy. However, clinically, the types of melanoma are diverse, and the onset time generally correlates with the patient's clinical phenotype. For some superficial types of melanoma with low malignancy, it generally takes several years to develop. For highly malignant melanomas, the disease generally progresses rapidly within about six months to a year. Once melanoma progresses, it can affect multiple parts of the body and severely impact the patient's lifespan.