Labial melanotic macule Mucosal melanocytic macules L Carnitine for Weight Loss: How It Works, Dosage & Best Supplement Zeelab Pharmacy Happy Wednesday! , In this video, a patients labial melanotic macule (a benign pigmented lesion) is being treated with liquid nitrogen. Labial melanotic macules are flat and asymmetrical with a L CARNITINE:HCL, O PROPIONYL Goss Scientific This patient has multiple labial melanotic macules. These are essentially freckles of the lips. These most commonly involve the lower lip. This patient had involvement of both the upper and lower lips.