Résumé
Classification of facial and neck melanosis [1]: * Melasma (chloasma) * Erythema dyschromicum perstans (Ashy dermatosis of Ramirez, erythema chronicum figuratum melanodermicum) * Lichen planus pigmentosus * Riehl’s melanosis (Pigmented cosmetic/ contact dermatitis) * Erythromelanosis peribuccale pigmentaire of Brocq * Poikilodermia Civatte * Erythromelanosis follicularis of face and neck * Nevus of Ota * Miscellaneous causes: Periorbital Melanosis Addison’s disease Exogenous ochronosis Post chikungunya pigmentation (reported in India, induced by alpha virus transmitted by Aedes aegypti and Aedes albopictus) Acanthosis nigricans In daily practice a skin biopsy is vary rare necessary for diagnosis, a through endocrinological examination is mandatory, sometimes an allergology test or a very attentive anamnesis are helpful (cosmetics involved).