Cystic
acne is basically boils that form under the skin. They can be found on the butt, armpits, groin and other places where sweat can accumulate in hair follicles.
Your daughter may have rosacea, which is a skin condition that causes redness, and painful bumps under the skin. I get the bumps quite often. Instead of being filled with pus, like most regular acne, mine are filled with blood.