If you don't mind mail order, I highly recommend acne.org's AHA+ lotion (in a very large tube). I alternate nights of this procuct with tretinoin, and it has made my old acne marks fade to practically nothing (even I have to look really closely to see them) and it has lightened sun/age spots for me too but very gradually.
Type: 3b/3c (i), below shoulder length. Modified CG since 5/2004; growing gray since 5/2007.
CO wash: A-O GPB LYY, Salon Care Honey Almond, Devacurl OC, rotating others
Leave-ins: BWC, KCKT, coconut oil overnight
Styling: BRHG, MGA Sculpting Gel, Aubrey Organics Mandarin Magic Gel, LOTD AVG, LALSG
DT: Terax Crema, Moroccan Oil Restorative Mask, Je Veux Revitalizing Mud Mask, Kiehl's Olive Fruit Oil Deeply Repairative Hair Pak, Curl Junkie Deep Fix