Familial generalized lentiginosis

Familial generalized lentiginosis is a rare inherited skin condition characterized by the widespread presence of lentigines — small, flat, brown to dark brown pigmented spots — distributed diffusely across the body. Unlike lentigines associated with sun exposure, these spots appear in both sun-exposed and non-sun-exposed areas, including the trunk, extremities, and sometimes the face. The condition typically manifests in childhood and the number of lentigines may increase over time. Familial generalized lentiginosis is distinguished from other lentiginosis syndromes (such as Peutz-Jeghers syndrome, LEOPARD syndrome, or Carney complex) by the absence of associated systemic abnormalities — affected individuals generally do not have cardiac, endocrine, or gastrointestinal involvement. The condition is primarily a cosmetic concern, and the lentigines themselves are benign melanocytic lesions without significant risk of malignant transformation. Diagnosis is clinical, based on the characteristic widespread distribution of lentigines and a positive family history. Histologically, the lesions show elongation of rete ridges with increased numbers of melanocytes and melanin deposition in the basal layer of the epidermis. There is no specific curative treatment for familial generalized lentiginosis. Management is largely supportive and cosmetic, with options including laser therapy (such as Q-switched lasers), topical depigmenting agents, and cryotherapy for individual lesions if desired for aesthetic reasons. Sun protection is generally recommended to prevent further pigmentary changes. Genetic counseling may be offered to affected families.

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