Although we often take them for granted, finger and toe nails have significant cosmetic and functional importance. Next to the face, the hands (and finger nails) are the most important as these two areas are almost always visible and are part of our image as a person. As genetic causes for nail disorders are somewhat uncommon, they are subject to disease including infections, tumors, and dermatoses, such as psoriasis. Toe nail problems can be covered by shoes but are often painful. Foremost is the need for a correct diagnosis of the problem by exam and laboratory assessment such as a biopsy or culture. As with many disorders, an early diagnosis usually results in a better outcome.