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lentigo simplex

Thursday 8 July 2004

The simple lentigo is a brown to black, sharply circumscribed and usually uniformly pigmented macule, measuring a few millimeters in diameter. It may be found anywhere on the body surface.

The term ‘labial melanotic macule’ is now used for a clinically similar lesion on the lip that was previously referred to as a lentigo.

Microscopy

There is variable basal hyperpigmentation with an increased number of single melanocytes in the basal layer.

There is usually acanthosis, with regular elongation of the rete ridges.

The papillary dermis may contain a sparse lymphohistiocytic infiltrate, including scattered melanophages.

Some lesions evolve with the formation of nests of melanocytes in the junctional zone, but it is best to designate these lesions with mixed features of a lentigo and a junctional or compound nevus as lentiginous nevi.

Differential:

- solar lentigo
- freckle
- melanotic macule
- lentiginous nevus

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