LENTIGO SIMPLEX IN ORANGE CATS
Lentigo simplex has been described in orange cats. The condition is characterized by asymptomatic macular melanosis usually beginning in cats younger than 1 year of age.
The lesions start on the lips and begin as tiny black asymptomatic spots that gradually enlarge and become more numerous with time. There can be lesions on the nose, gingiva,and eyelids in addition to the lip. Well-circumscribed, generally circular areas of intense uniform macular melanosis,ranging from 1 to 9 mm in diameter and occasionally coalescent, are present in variable numbers. The surrounding tissue is normal. The lesions do not vary in the intensity of hyperpigmentation with the time of year. They are asymptomatic, do not develop into melanoma, and have no identified cause.
Histopathologic findings include marked hypermelanosis,predominantly of the basal cell layer of the epithelium, that is caused by the increased numbers of melanocytes and by hypermelanosis of the neighboring basal keratinocytes. Occasionally, melanophages are seen in the the superficial dermis.
Lentigo simplex is a cosmetic defect. These lesions do not require treatment, but if it is desired, surgical excision is the only way to eliminate them.
Muller and Kirk's Small Animal DERMATOLOGY
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