Mucosal melanotic maculehttps://en.wikipedia.org/wiki/Oral_pigmentation#Melanotic_macule
Mucosal melanotic macule in mucosa labii, palati et gingivae oralis inveniri potest. Mucosal melanotic macule est laesio pigmentata benigna quae in cavitate oris invenitur, ex incremento pigmentationis epithelii et laminae propria. Typice area est fusca, nigra, caerulea vel grisea, bene circumscripta; lesio plerumque minor quam 10 mm diametri, sed in quibusdam casibus maior esse potest. Est morbus benignus.

○ Diagnostica et curatio
Valet serenissime, si uniformis est in figura et colore.

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      References Black and Brown: Non-neoplastic Pigmentation of the Oral Mucosa 30671761 
      NIH
      Addison’s Disease (Hypoadrenocorticism),Peutz–Jeghers Syndrome,Laugier–Hunziker Syndrome (Idiopathic Lenticular Mucocutaneous Pigmentation),Drug-Related Discolorations,Melanotic Macule,Melanoacanthoma,Smoker’s Melanosis,Amalgam Tattoo/Foreign Body Tattoo,Black Hairy Tongue