I can understand your concerns.
I believe your gel contains Adapalene
,if so then it's quite common to have some redness
,irrtation and dryness after using it.
Therefore I advice my patients to start with it as follows
Ist night for one hour on ye affected areas
Second night for 2 hrs
Third night for three
And fourth night for four hours
Then after this period apply it overnight and the wash your face with a soap free face cleanser(Nivea) in the day.
It can also make your skin more sensitive to sunlight so liberal use of a sunblock of Minimum SPF 30 is advisable throughout the day.
As far a scars
are concerned then please see your dermatologist
and discuss the options of Microdermabrasion
and chemical peeling to lighten the scars,they are very effective.
I hope you ll find these answers helpful.
Thanks a lot and all the best.