In this article, I begin by giving a brief history of melanoma causation. I then discuss the
current manner in which malignant melanoma is classified. In general, these systems of
classification do not take account of the manner of tumour causation. Instead, they are based
on phenomenological features of the tumour, such as size, spread, and morphology. I go on to
suggest that misclassification of melanoma is a major problem in clinical practice. I therefore
outline an alternative means of classifying these tumours based on causal factors. By analogy
with similar systems that have recently emerged for other cancers, I suggest that this causal
classification is likely to be both workable and helpful, even in the absence of a full causalmechanistic
understanding of the aetiology of the tumour
