Nail disorders

Synovial cyst

Typically painless, treatment involves draining and removing the cyst.
Psoriasis of the nail

A large increase in the speed of epidermal cell production causes scaly patches to form on the nails. Psoriasis may be caused by infection, stress, or be drug-induced.
Clubbed fingers

Clubbing (acropachy) often occurs as a symptom of conditions associated with a decrease in oxygen levels of the blood (e.g., kidney failure, lung disorders, bowel disease, and some heart disorders).
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Discolored nails

This patient
Beau

A Beau
Psoriasis of the nail

Psoriasis occurs when excessive growth of skin cells leads to plaques of itchy, scaly, and thickened skin that may become infected.
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Onychogryphosis

Onychogryphosis is a distortion of the toenails attributable to chronic irritation and inflammation.
Melanonychia

The two types of melanonychia, a nail discoloration caused by melanin are transverse and longitudinal (shown here), which may be a sign of subungual melanoma.
Onychomycosis (tinea unguium)

Tineal infections are caused by dermatophytes and may be acquired from an infected person, an animal, soil, or shower floors.