This lesion is a superficial spreading malignant melanoma. The incidence of malignant melanoma is doubling every 10 years and accounts for approximately 1000 deaths annually in the United Kingdom. Public education has increased the number of thin tumours detected but the number of late presenting lesions remains unchanged. Risk factors include giant melanocytic naevi, dysplastic naevus syndrome and a history of recurrent sunburn. They are usually slightly elevated with variable coloration.
Nodular melanomas are aggressive tumours and occur in a slightly younger age group.
They are often uniformly coloured with early ulceration and bleeding. Lentigo Maligna is the least aggressive form of melanoma. It is commonly seen on the face of the elderly and presents as a pale brown macule. Its indolent growth and often means that no treatment is required. Acral lentiginous melanoma is the most frequent type seen in Negroes and Orientals occurring on the palms of the hand and soles of the feet.