Melanomas are always malignant; there are no benign melanomas.

Benign lesions are called pigmented nevi, which are usually classified into three types: intradermal nevi, junctional nevi, and compound nevi. When a pigmented nevus becomes malignant, it is then referred to as melanoma. Therefore, in clinical practice, when we mention melanoma, we are referring to malignant melanoma.

Malignant melanoma is staged based on the degree of invasion and whether it has metastasized. Treatment methods vary depending on the stage, and there are differences in treatment approaches.

Therefore, if a pigmented nevus visibly enlarges over a short period, and shows symptoms such as ulceration, bleeding, or pain, it is necessary to promptly visit a reputable hospital's dermatology department for surgical removal, followed by a pathological examination.