In your case, if you had bouts of acne before,
and the bumps do not appear to involve follicles
and also do not appear to blister
and crust, then this is most likely acne.
For localized bumps such as what you have, the mainstay is sticking to a proper facial cleansing regimen. Use a mild and bland product that is hypoallergenic and noncomedogenic. Use a mild toner to tighten the pores and do not exfoliate at this point.