My wife had noted a black spot.. Mostly the spot is having outer layer black on her lips 2 months ago... But she ignored it stating it will go on its own.. But it never vanished in these days we went to dermatologist... Dermatologist suggested fusidic cream to apply for 15 days...10 days are over but that spot is still there...also I had asked her if it's melanoma so she said it's not melanoma.. And my wife is only 34 years old so she will not get melanoma... But I am scared reading it on google...kindly suggest what it is and it's treatment... The spot size not increased or decreased.. I am attaching the Image