If your nails are not smooth, you may be lacking zinc, calcium, or vitamin A, or developing a skin problem such as eczema or psoriasis. Pitting, or tiny dents, is often linked to these issues. These changes show as small pits or wave-like patterns. Psoriasis is known for causing nail pitting, and the severity often matches skin symptoms. Other conditions like alopecia areata or lichen planus can also cause pitting. Good nail care can help prevent extra damage, but treatment usually focuses on the underlying condition, not just the nail changes.