Hello,as you have mentioned that you have acne prone skin so first priority should be to control acne and then to treat marks
These are the following steps to control acne and lighten marks
1.use facewash which contains salicylic acid.
2.alcohol free toner or rose water.
3.cream containing clindamycin on acne.
4.non comedogenic moisturiser.
Next Steps
you should consult cosmetologist or dermatologist to understand root cause of acne and creams which will help you out for acne and acne marks.(as self medication may aggravate the problem)
Health Tips
1:Use non comedogenic gel based sunscreen.
2:Drink min. 7-8 glasses of water daily
3:Avoid high glycemic index food(like potatoes,milk,white bread etc.)
4:Eat food rich in zinc,vit.A &E,antioxidants (I.e.yellow and orange coloured food like oranges,carrots, apricot,)
green leafy vegetables,tomatoes, blueberries etc.