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James Ioli, Podiatry, answeredYour skin and toenails reveal a lot about your overall health and can provide the first sign of a systemic disease. For instance, nails that are rounded inward like spoons, rather than outward, may indicate a severe iron deficiency. Nails that are pitted and thick are a sign of psoriasis. If you notice any abnormality in the shape or color of your toenails, ask your foot care specialist about it.