A lentigo on the lip is a flat, light brown spot, usually found on the lower lip, where sun exposure is more common. The two dark brown, flat marks are typical of lentigos.
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Lentigo Simplex  Information for adults

Picture of Lentigo Simplex: A lentigo on the lip is a flat, light brown spot, usually found on the lower lip, where sun exposure is more common. Divider line
A lentigo on the lip is a flat, light brown spot, usually found on the lower lip, where sun exposure is more common.
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Overview
Lentigo simplex is a type of color-containing (pigmented) lesion not caused by sun exposure, which looks like the freckle-like condition (lentigo) caused by sun exposure (solar lentigo). In both conditions, an increased number of pigment-producing cells (melanocytes) are present. Lentigo simplex can occur anywhere on the body, including areas that are not exposed to sunlight. Multiple lentigos are associated with several inherited syndromes, but lentigo simplex can also occur as a single lesion. Single lesions often develop on the lips or on the gums. Lesions may be caused by some forms of ultraviolet light therapy. If this is the case, the lesion may be seen as identical to those caused by exposure to sunlight.
Who's At Risk
Lentigo simplex may occur in people of all ages. The lesions usually appear first in early childhood, but they can also be present at birth or develop later in life.
Signs and Symptoms
Lentigo simplex can occur anywhere on the body, including areas that are not exposed to sunlight. They appear as brown to almost black, small spots (macules), usually 3 mm or smaller in diameter. The edges (margins) may be smooth or somewhat jagged with even distribution of color.
Self-Care Guidelines
None necessary.
When to Seek Medical Care
See a physician for evaluation of any colored (pigmented) lesion if you are not sure what it is.
Treatments Your Physician May Prescribe
Lentigo simplex is a non-cancerous (benign) lesion. Your physician may recommend:
  • Periodic follow-up evaluations.
  • Surgical removal of single lesions that may be difficult to distinguish from malignant lesions, such as melanomas.

References

Bolognia, Jean L., ed. Dermatology, pp.981, 1761-1763. New York: Mosby, 2003.

Freedberg, Irwin M., ed. Fitzpatrick's Dermatology in General Medicine. 6th ed, pp.863, 882-884. New York: McGraw-Hill, 2003.
Last Updated: 22 Dec 2008