Learn about the different types of skin cancer (melanoma, basal cell carcinoma and squamous cell carcinoma) and make sure to check your skin all over your body for any strange growths or spots.
19. Changes in nails
Unexplained changes in the nails can be a sign of several types of cancer. A brown or black streak or spot under the nail may indicate skin cancer, while newly discovered "clubbing" (widening of the fingertips with nails that curve downward at the tips) may be a sign of lung cancer. Pale or white nails can sometimes be a sign of liver cancer.
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