Nail pitting is a condition characterized by small depressions or indentations on the surface of the nails. These pits can vary in size and depth, and they may appear on one or multiple nails. Nail pitting is often associated with skin conditions like psoriasis and eczema, but it can also occur without any underlying disease. The exact cause of nail pitting is not fully understood, but it is believed to result from disruptions in the nail matrix, where new nail cells are produced. While nail pitting is generally harmless, it can sometimes indicate an underlying health issue, so consulting a healthcare professional is advisable if it appears suddenly or worsens.