Some of the most deadly skin cancers may start in stem cells that lend colour to hair and originate in hair follicles rather than in skin layers says a new study. Hair follicles are complex organs that reside within skin layers. It is there that immature pigment-making cells develop cancer-causing genetic changes - and in a second step - are exposed to normal hair growth signals. The study published in the journal Nature Communications found that unlike their normal counterparts newly cancerous pigment stem cells then migrate up and out of the follicles to establish melanomas in nearby surface skin