Mucosal melanotic macule https://en.wikipedia.org/wiki/Oral_pigmentation#Melanotic_macule
Mucosal melanotic macule e ka fumanoa ka har'a mucosa ea molomo, molomong, mahalapeng le gingiva. Mucosal melanotic macule ke diso tse nang le mmala o mobe tse fumanehang molomong wa molomo, tse bakwang ke ho eketseha ha mmala wa epithelium le lamina propria. Ponahalo ea bongaka hangata ke sebaka se brown, black, blue kapa gray se pota‑potiloeng hantle. Diso hangata li ka tlase ho 10 mm ka bophara empa li ka ba kholo maemong a mang. Ke boemo bo sa kotsi (benign).

Tlhahlobo le Kalafo
Hangata e bolokehile haeba e tšoana ka sebopeho le 'mala.

Lintlha tse ling ― Sesotho
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