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  • Photo of a man hiking outdoors

    Nail fungus

    Nail fungus is a very common problem. It causes the nails to become brittle, discolored or thicker. Doctors think that fungal nail infections are oft...

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    Structure of the nails

    Fingernails and toenails are made from skin cells. Structures that are made from skin cells are called skin appendages. Hairs are also skin appendage...