Hi I'm 24 Year Ols And Went Through Severe Acne

Hi I'm 24 year ols and went through severe acne when I was 21-22 but for the past 2 years I'm not having acne and with time all the scars have gone away but I've started to notice some dents on my skin now I don't know why they're appearing now when I have completely gotten cured with the acne problem I don't get any pimples now but the appearance of dents is alarming me as they're said to be irreversible damage. Can you please guide me as to what exactly should I do to stop this and get my skin smooth again as it was last year
Looking forward to some helpful response.