How many sessions of acne treatment are recommended?

I never had acne during my school days, but after becoming an adult, it started popping up one by one, and now it has spread all over my face, which is really distressing. Thinking it might be stress or a dietary issue, I have tried taking supplements and switching out all my cleansing products, but the cycle repeats: it seems to subside for a while only to flare up again.

I feel like I can no longer handle this on my own, so I am planning to seek professional acne treatment. People around me have also advised that starting treatment early is the way to save money in the long run, rather than touching it and leaving scars. I am concerned about whether acne treatment will definitely help manage my recurring breakouts and red marks.

I would like to know the general recommended number of treatments for recurring adult skin problems like mine. Although it may vary from person to person, I would appreciate advice from those who have experience on whether it resolves quickly or if a long-term approach is required to complete a certain number of recommended treatments.