Have you been using one of those facial tanning moisturisers if so its fading and you may just need to hurry it up a bit
Exfoliation sounds like it might be needed, store cupboard rescue mix caster sugar, olive oil and honey in a paste, massage in gentle circular movements using your finger tips and leave for 5 mins and clean off with a warm clean wash cloth...
Exfoliation is the key. I use either salt or sugar, lemon or lime juice and mix into a grainy paste. But the best thing you can do for your skin is drink plenty of water and eat lots of fruit, veg, wholegrains and lean protein (particularly oily fish). Sleep will also do your skin and your general health the world of good.
honey and oats is another good home made remedy. but a routine of cleanse, tone , moisturise ans twice weekly exfoliating is a must. squeeze in a peel off mask every now and then as well - it's also good for a laugh!!! x