Is this purging??2 months into tret and still getting pimples leaving stubborn marks

Hi, i have been using tret 0.025 for exactly two months now. I use it 2x a week still since i tried to up it to 3x a week but skin felt too irritated.

I never had acne before and never got any pimples before tret use. I was prepared for the purge. But every week i get at least 2 small pimples which go away in 10 days but leave a dark spot.

Is there anything i can use to improve the spots? Should i change from cream to gel? Should i increase the frequency and buckle up through irritation?

Please give me advice if youve been through the same:)

Routine-:
Morning-

Facewash/no facewash on morning after tret
Rosewater+Glycerine
Cosrx Snail mucin
Bioderma intensive baume (when i feel i need my skin needs it)
Another later of moisturiser (started this just this week and skin feels better i think)

Sunscreen spf 50 - if im out if the house

Night-
Facewash (i use only gentle facewashes)
Let face dry for 30 mins
Moisturiser around eyes and mouth
Tret
Bioderma intensive baume. (Started applying this after tret only this week after i was suggested on here- i did it once and my skin feels better)

(On no tret night i apply bioderma intensive Baume)

Also im 22f. Using tret for hyperpigmentation and anti aging/glass skin. I have never had acne before. My hyperpigmentation has improved.