Hyper-pigmentation

hi everyone,

i was wondering if anybody could give me some advice.... since last summer i have had some darker patches come up on my face on my upper lip. this is the only area of my face affected so im sure you can imagine how much it stands out. im naturally fair skinned, although tan easily. this summer the patches are even worse and now really bothering me. iv been told its only come up here as that area of skin was probably more sensitive to the sun because i wax/ immac there. iv been staying out of the sun but its not going, and wondered if anybody else has experienced this or anybody knows any products i can use to help?? any advice would be great guys....thanx