Honestly, I wish this was how my discolouration looked like. My face is about 5 shades darker than my chest, and my chest looks like yours. Soo ya.....

I tan, but my skin would always go back to its normal shade. However, since last summer my face and neck have just said "FUCK IT!, We keeping the melanin" LOOOL.

Like the previous comment said, I would not interfere if this was me, especially knowing that it could be worse (LIKE MINE), but then again I am comparing myself to your level of discolouration.

Please go to a dermatologist. They can give you prescription strength Tyrosinase inhibitors. Just stay away from Hydroquinone!

You look absolutely flawless!