“Shadow” above top lip

Hi everyone,

I am a 29F in despair! I have noticed the last few months I have a “moustache” but seems as though it’s my actual skin and not hair (I hope this is making sense) and even though I remove the hair above my top lip it still remains so in certain lighting it looks like I have dirt above my mouth. Does anyone know how I can lighten or remove it? At first I thought it was maybe a build up of dead skin but nothing seems to work. The best example I can think of is when I wear make up it looks like I have a moustache because of the dark area