I would recommend you have a detailed talk with your doctor on the timeline and history of your outbreaks. Adult onset acne is a common occurrence and can be due to issues ranging from hormonal issues, change in skincare as you mentioned, or even undiagnosed medical conditions.
Treatment then depends on the underlying problem. Initial treatment to reduce sebaceous gland activity and reduce acne occurance and the other issues that follow, such as scars and redness, can be managed with techniques ranging from lasers and peels to oral medication.
Ultimately the resolution may depend on the effective elimination of the underlying problem.
So do seek a proper detailed consult to find a more definitive solution to your current issue.
All the best,