The appearance of this sign under your fingernails suggests your skin cancer!

The researchers warned that dark lines (brown or black) appear on the nails where they could be markers of skin cancer, according to Skin Cancer.

"These cancer cells can destroy surrounding healthy tissue, including vital organs," noted the researchers, noting that the appearance of dark lines under the fingernails could indicate an increased risk of skin cancer.

At the same time, researchers have emphasized the need to pay attention to this rare form of skin cancer because it is secondary and it is easy for many to think that it is simply a bruise.

"Skin cancer usually appears in the most sun-exposed areas of the body, such as the chest, face, back, legs, ears, and arms, but we did not know until it was can also appear under the nails, "he said.

It was found that secondary skin cancer accounted for about 2% of all skin cancer cases and was generally in the form of brown or black lines under the fingernails.