The best way to fix them: Since they're more closely related to bacteria than your hormones or a lack of exfoliation, papular pustules require a different plan of attack entirely. "Inflammatory acne types really respond to antibiotics, either topical or systemic," says Dr. Hale. These, of course, require a trip to your dermatologist. To tide you over, you could also try applying hydrocortisone cream, which temporarily takes down redness and swelling. But in the long run, it won't do much to make these disappear completely or keep them from popping up again.
No one factor causes acne. Acne occurs when sebaceous (oil) glands attached to the hair follicles are stimulated at the time of puberty or due to other hormonal changes. Sebum (oil) is a natural substance that lubricates and protects the skin. Associated with increased oil production is a change in the manner in which the skin cells mature, predisposing them to plug the follicular pore. The plug can appear as a whitehead if it is covered by a thin layer of skin, or if exposed to the air, the darker exposed portion of the plug is called a "blackhead." The plugged hair follicle gradually enlarges, producing a bump. As the follicle enlarges, the wall may rupture, allowing irritating substances and normal skin bacteria access into the deeper layers of the skin, ultimately producing inflammation. Inflammation near the skin's surface produces a pustule; deeper inflammation results in a papule (pimple); if the inflammation is deeper still, it forms a cyst.