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priyanka,for acne scars
esp pits or depressed scars ,the best would be laser
resurfacing (fractional laser).Next would be Derma roller ,which is a small instrument which is rolled over skin to cause collagen
remodeling ,and thus cause lifting of acne scars.
Chemical peeling has a very minimum result on acne scars.It works best for pigmented lesions or black spots left by acne.Chemical peel is safe if undone under experienced hands of a dermatologist( don't get it done in beauty parlor or by technicians).You require multiple sessions for all these procedures.
If scars are deep then one can go for punch excision and replacement or punch flotation.
So,consult a dermatologist
who has above facilities and is experienced to use lasers.