Just as a war has a post-war effect (on the completion of the war), acne healing is not the end of the story. It is the beginning of a new series of efforts to control the scars, and if possible, to obliterate it totally. It is the reformation and rehabilitation process for that particular patch of the skin.
Many people recoup the original health of the skin, without any permanent effects. But many have to suffer disfiguring scars. Topical skin care products and medication...