Will the acne treatment really show noticeable improvement?

Hello, I am an office worker struggling with adult acne. I am writing this post because I am curious about the effectiveness of acne treatments ahead of my dermatologist consultation. I feel that diet control alone at home has reached its limit, so I am considering professional treatment. I am curious about reviews regarding the speed at which inflammatory acne subsides and the reduction of redness. Although it may vary from person to person, how many sessions does it usually take to feel the effects of acne treatment? If the treatment is proven effective, I would like to start immediately, so I would appreciate advice based on facts.