Acne marks are hard to get rid off and you need to have lot of pateince.Along with the home care you need to have some professional treatments.
Recomended professional treatment;
Peeling treatment which is done by skin therapist where the peeling pack is used made up of papaya enzimes(good for removing scar),zinc and powder mixed with egg white or raw milk.Than peeling machine is used on the surface of skin to clear the impurities or marks.The process has to be repeated once in a week for first few sittings than after 15 days.this skin treatment takes time.
Derma Brasion: this is advance type of skin treatment to remove scar,blemishes or skin lightening,treatment is expensive but result oriented.
Another option is to use the ampules available n aroma magic or for home remedy mix 1spoon of fresh cream,few drops of lemon squeeze apply on the marks ,wait for few minutes until its absorbed and than rub it slowly with the cotton ,repeat after 3 days it helps in lightening the scar as well.
hope this will help you in sorting your problem.
Dermal therapist& Specialist Make-up artist