14. Sore/lump on the skin that bleeds, becomes crusty or doesn’t heal
Different types of skin cancer (melanoma, basal cell carcinoma and squamous cell carcinoma) can cause these, so be aware of any odd-looking growths or spots.
15. Changes in nails
A brown/black dot under the nail can indicate skin cancer. Pale or white nails can be a sign of liver cancer. “Clubbing”, which is the enlargement of the fingers with nails that curve down over the tips, can be a sign of lung cancer.