<s>[INST] I ve had black spots on my tongue for years and no its not birthmark or it wasn t there when I was born.please help!!any treatment or home remedies? I also have black gums and have blackness on the corner of my lips but not the whole lip thx in advance! [/INST] if u have black spots on ur gums or tongue then the most possible reason for that is it may be due to vit b12 deficiency. So u should first go for lab investigations for HB and vit b12 level. then u have to take medications accordingly... thanks </s>