What's beneath this love-heart shaped lesion?

Confusion persists as to the role of naevi in malignant melanoma cases

The majority of melanomas arise without any evidence of a pre-existing naevus.

heart-shaped lesion

In cases where melanoma does occur in association with a naevus, there is persisting confusion about whether the malignancy arises as a distinct clone of cells within that naevus or whether the naevus undergoes a transition to melanoma. 

This has fuelled an unsupported belief that certain types of naevi should be excised to prevent melanoma.

What is clear is that the morphological separation of naevus from melanoma