I have darkening of my vaginal area and inner thighs any removal tips?

its ugly and i feel it looks hideous,its like really dark (browny / grey / blackish colour), and i have like a caramel color- it puts me off intimacy with my husband because i feel it just looks wrong. Its causing me great upset, the only thing I could thing of asking was if it could be bleached white again ? What causes this, i know pressure and friction etc - but i just dont feel normal - its making me really depressed and want to avoid my hubby seeing me intimately in the light etc ! Please help, it's very embarrassing to be honest - i am a really thin girl so its confusing me cause my legs bearly rub.I'm In great shape,eat healthy...just I don't see were fiction can come into play here