There are a lot of great products out there with Hydroquinone which helps lighten dark spots. Such as Bleaching Cream with Hydroquinone by Black And White you can find it at Walmart and drug stores around $6 or less.

I have very sensitive skin and I cant use hydroquinone products but I have found a great line through Avon, www.avon.com, it's there Anew line and it works great on people with sensitive skin. My favorite products are the Luminosity Ultra Advanced Skin Brightener $22 and the Clinical 2 step Facial Peel $32. Both fade dark spots, no irritation, and they are very gentle on the skin. I havent had any break outs since using these products.

Avon usually have good campaigns and you can buy they together to cut down on the price.

Hope that helps.

I don't know that hydroquinone products would be appropriate for acne scars; it is usually used for hyperpigmentation to lighten the skin where too much melanin is produced.
Several companies have products specifically for acne scars. Neutrogena's Advanced Solutions makes both an acne scar fading masque, and a couple of exfoliating or microdermabrasion products. I would try those first. Also, there are several general scar-fading products, like Mederma.

ever try ambi products? i heard it works pretty well. something i know for sure that works is the body shop's cocoa butter stick, but if you have oily skin, it might not be right for you.