How to manage severe acne in a teenage boy?

The severe acne problem of a teenage boy, who has difficulty finding time for himself during his studies, is a source of concern for the entire family.

The child has acne all over his face.
Moreover, it is unfortunate that as acne heals, severe red or black pigmentation remains, which lowers the overall self-confidence of the skin.

I'm also worried that if I leave it like this, it will leave deep acne scars even after I become an adult.
1. One of my concerns is whether I should start active treatment now.
Or I can't decide whether to do as people around me say, 'It's because of the hormones, so wait a little longer.'
Actually, this is a time when time is not so convenient.
2. First of all, is there a home routine, such as washing and skincare, that I should check and change first to prevent the worsening and spread of acne? (I am wondering if using acne cleansers or products containing (BHA) or 'AHA' ingredients is safe for teenagers' skin.)

I'm seeking advice on how to safely and effectively manage my growing child's severe facial acne and pigmentation, and help maintain clear skin long-term.