When the normally smooth surface of the fingernail has several small dents or pits in it, that can be a signal that something is going on beneath the nail. Most often, the cause of those dents is psoriasis.
The inflammatory skin condition-it shows up as red, scaly patches on the skin-can also affect the skin cells in the nails. Instead of growing out smoothly, the surface of the nail takes on a dented appearance. Once the psoriasis is treated and under control, nails will slowly return to normal. (Since nails only grow about a millimeter per week, it will take a few months for the old, pitted nail fully grow out and be replaced with a healthy one.) Search for images of pitted nails.
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