My face looks old because of acne and acne scars. Please help.

Hi doctor,

I am asking questions on behalf of my son. Due to pandemics, we are not allowed to consult a dermatologist in person. But his skin has changed drastically. He is 16 years old and his face looks old. He has dark spots due to acne scarring and so he decided to use Ambi skincare fade cream. He thought it would make wonders on his face. But it caused red, darker, larger spots on the forehead, chin, and sides of the cheek. He left it for few days. After that, he decided to use some home remedies. He found that garlic will fight on dark spots and so he used it on the face. It caused a burning sensation on the face. On the next day, he had skin irritation. Now, his forehead has wrinkles. He also has some huge dark yellowish and brownish patches on the skin with acne. He has tried using some homemade recipes to lighten the face. But it has not worked. He tried to boost melanin and collagen. But there are no good results. Now he is using anti-wrinkle cream. He cannot see any good results and his skin is getting worse. I have told him to give some time for the skin. Kindly suggest.