Free training tool for medical professionals and students to use to sharpen their eye for spotting skin cancer. Use this app if you've already had some basic training and want a lot of examples to work through in your free time. If you need a full course in recognizing skin cancer this app is not the place to start. Half of photos are benign, half are malignant (melanomas). Remembers what you got wrong on the last training set, so you can re-test yourself later.