<s>[INST] i hv a black mark on ma chin. please sugeest me somethin to remove tat. i tried many medicines and creams .but no result [/INST] Hi..dear user., Thanks for choosing HCM., You mentioned only black mark...But not duration, symptomatology, So If it is long duration..(by birth)..Epidermal Naevi.. short duration with itch...you can remove by..., RF.cautery.. or LASER THERAPY... ok..first evaluate..the lesion consult good dermatologist.. do accordingly....,bye good luck </s>