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The scary reason to keep an eye on your (unpolished) nails

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Photo: Stocksy/Lyuba Burakova

As you go about your routine skin-cancer checks to look for abnormal moles or dark spots, there’s one place you probably didn’t think to examine: your fingernails.

According to The Sun, when UK-based manicurist Jean Skinner spotted an unusual mark on a client’s nail, she instantly knew something was off. The customer had a straight, dark vertical stripe running down her nail and requested a polish color that would cover it up.

Subungual melanoma typically shows up on the nail of the thumb or big toe and should be brought to the attention of a doctor immediately.

Some of the former nail salons the client visited suggested the mark indicated a lack of calcium, a blood blister, or a hereditary feature, but Skinner disagreed.

“[I knew it was] melanoma. I didn’t want to frighten her, but I told her she needed to see her doctor immediately,” Skinner wrote on Facebook. “She called me today to tell me that yes, it was a very aggressive melanoma that has already spread to her lymph nodes. Her prognosis isn’t good.”

Although this specific type of skin cancer is rare, it’s serious: According to the Melanoma Research Foundation, subungual melanoma typically shows up on the nail of the thumb or big toe and should be brought to the attention of a doctor ASAP.

The next time you notice something’s off—especially if it’s a fresh streak of color on your nail—don’t try to cover it up with polish; your nails could be telling you something about your body’s health that you don’t want to ignore.

Going all-natural with your nails? Here are 5 things you should know before your next manicure. Also, these designs are sure to up your nail art selfie game.