Post acne hyperpigmentation or post acne scars...
Means after pimples(acne) it may leave blackish spots which we call it as post inflammatory hyperpigmentation or else it may be pits or scar.
There are different procedures are available like chemical peels,Qswitched lasers,
Microderma abrasions...etc for black spots.
For pits or depressed scars -you can go for the co2 fractional laser, Rf micro needling,erbium yag lasers,dermaroller,..etc.
Next Steps
so please send the photo so we can differentiate it wether scar or pigmentation or else you can meet nearby Dermatologist for further treatment &opinion.