Superficial spreading melanoma
(重定向自Superficial spreading malignant melanoma)

Superficial spreading melanoma (also known as "Superficially spreading melanoma") (SSM) is usually characterized as the most common form of cutaneous melanoma in Caucasians. The average age at diagnosis is in the fifth decade, and it tends to occur on sun-exposed skin, especially on the backs of males and lower limbs of females.