Hyperpigmented Upper Eyelid: A Clue to the Diagnosis of Facial Lichen Planus Pigmentosus in a Patient with Frontal Fibrosing Alopecia.

Facial lichen planus pigmentosus (LPPig), a rare variant of classic lichen planus, was first described in patients with frontal fibrosing alopecia (FFA) by Dlova [Br J Dermatol 2013; 168: 439-442] in 2013. The diagnosis of facial LPPig is sometimes not easy, since clinical signs and histopathological features may frequently be confused with melasma or postinflammatory hyperpigmentation. We describe a case of a postmenopausal black woman diagnosed with FFA who presented with an identical brown-grayish pigmentation of the face and upper eyelids and typical dermoscopy analysis on both regions. We suggest that the hyperpigmentation of the upper eyelid with typical LLPig dermoscopy (upper eyelid sign) may be a clue for the diagnosis of LPPig and may avoid a scar-causing face biopsy.