Most teens who develop acne have the milder form, called non- inflammatory acne. They just get a few blackheads or whiteheads and a pimple now and then. Pimples usually do not scar unless squeezed or picked which may lead to infection. It can injure skin and underlying tissue. So it's advisable not to pick or squeeze.
Some people suffer from inflammatory acne.
With inflammatory acne, the whiteheads become inflamed. Pimples and pustules develop and there will be a constant outbreak covering the face, and sometimes the neck, back, chest and groin. These pus filled pimples can cause disfiguring cysts, deep pitting and scarring. Prescription drugs and sometimes surgery may be needed to treat severe inflammatory acne if all other treatments have failed. More adults today find themselves dealing with acne, something they thought they had long outgrown.