yeah, I heard about that from the fourth movie and how they had some bad acne and did a lot of retouching in certain scenes

No surprise (to me of course ). Pretty much every teen comes across at least one pimple or blackhead or whatever in their lifetime - young adult (or even in the middle of your life - my 46 year old mom found a pimple on her face after she changed face creams) or teen (more common)