Verruca vulgaris. The common wart is a benign growth caused by localized infection with one of the many types of human papillomavirus. These small DNA viruses are part of the papovavirus group. Warts are especially common among children and adolescents and may occur on any mucocutaneous surface. The hands are a particularly frequent location. The typical wart is a roughsurfaced nodule that may be either lighter or darker than the surrounding skin.
Transient neonatal pustular melanosis. This is a benign neonatal dermatosis that is most common among African- American infants. The original lesion is a vesiculopustule, which may be present at birth. This small blister quickly ruptures and leaves a typical collarette of superficial scale processes. Tzanck smear of a pustule of erythema toxicum neonatorum will reveal numerous eosinophils but no multinucleated giant cells or bacteria. Occasionally, peripheral eosinophilia is also present. The cause of this condition is not known, and it resolves spontaneously within 10 days. No treatment is required.
Sucking blister. The oval blister pictured here was present at birth and is a result of normal sucking behavior in utero. Sucking blisters are fairly common and are usually located on the forearm, wrist, or hand. They are most often solitary and involve only one upper extremity. However, lesions involving both hands, or even involving a foot, are sometimes seen. The sucking blister resolves spontaneously as soon as bottle or breast is offered as a dietary substitute.
Xerosis. The accentuation of skin markings and fine scale illustrated here are typical of xerosis. The tendency toward dry skin tends to be inherited and is more common in families with a history of atopy. Low humidity, usually related to dry heat during the winter months, is an aggravating factor. Treatment of xerosis is aimed at rehydrating the stratum corneum. Emollients containing urea or alpha-hydroxy acids are particularly effective. Excessive bathing and the use of alkaline soaps must be avoided.