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"There is a huge amount that a well-trained dermatologist can tell about your overall health just by examining nails. From nail bed discoloration (blueish means lung disease), to capillaries in the cuticles (autoimmune disease), to yellow, white, or banded nails, sometimes very serious or even life-threatening disease can be diagnosed just by examining the tips of your fingers," Krant says. "So if you see something wrong or unusual, like a dark brown patch on your cuticle that also has an accompanying brown streak up across the whole nail plate (melanoma), see a dermatologist for help." By Laura Schocker

09/24/2013 08:42am EDT | Updated December 6, 2017

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