How the app works

The Skinvision app (free from the App Store) uses fractal geometry, which looks for patterns in the outlines and dimensions of a mole that make it more likely to be malignant. A normal mole has a smooth, consistent edge, but a melanoma is more likely to have a jagged or irregular outline. Also, non-cancerous moles are usually one colour but a melanoma is made up of multiple shades. The app then classes the mole as high, medium or low risk and advises action.