5.Nails are a health indicator – A good dermatologist  can tell about your overall health just by looking at your nails. If your nails are blueish means lung disease; yellow, white, or banded nails, sometimes very serious or even life-threatening disease. So if you notice anything unusual in your nail color like a dark brown patch on your cuticle that also has an accompanying brown streak up across the whole nail plate then visit a dermatologist.

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