Most melanomas start in normal skin, with fewer than a third developing in existing moles.
It may become darker or appear to have different shades of colour. Any unusual marks on the skin that last more than a few weeks, or an existing mole which shows any of the above signs should be shown to your doctor. Very few ordinary moles become malignant melanomas but it is best to discuss any changes with your doctor, as the sooner the disease is discovered, the more successful the treatment. All rights reserved. Readers are strongly advised to discuss the information with their doctor.