Blackheads and Whiteheads

Formed when the openings of hair follicles get blocked with oily secretions, bacteria, and dead skin cells, blackheads and whiteheads are perhaps the most noticeable and most easily treatable of acne symptoms. Blackheads get their name from the dark appearance that is formed when they clog a hair follicle, typically either because a part of the hair remains in the follicle or the secretion has darkened in color since the blockage formed. The actual "black head" itself is the plug that keeps the follicle blocked, and can be easily removed with a special strip.

Whiteheads, on the other hand, are formed the same way but result in an already-closed follicle. This prevents the actual head from appearing, and results in a slightly whither appearance than the skin's natural tone. These are less noticeable, perhaps less embarrassing, but can be treated in much the same way as blackheads -- easily and with special removal strips from a pharmacy or retail store.

Papules

These typically accompany a so-called ingrown hair, having developed over top of the affected an blocked follicle. They're signaled by an irritable sensation to the touch and will often turn a bright, throbbing red color. In some instances, especially those which are less noticeable inflamed and irritable, they may develop a darker red color that tends to have less of a throbbing sensation as well.

Pustules

These are perhaps the classic image of an acne breakout: the red, irritated, and inflamed raised bumps that contain a small amount of pus within them. They are typically identifiable by a large white "head" at the tip of the pustule that merely serves to demonstrate just how full of pus these blemishes are.

Nodules

Of all acne afflictions, these are likely the most painful. Unlike the raised pustules that are easily manageable with treatment, nodules are below the surface of the skin. They feel much like bruises to the acne sufferer, and are typically red and enflamed for a much larger surface area on the skin than the usual acne pustule would be. These nodules are formed by the secretion of oils that extends much further below the skin's surface than either pustules or papules generally do.

Cysts

Perhaps the most rare of acne symptoms experienced by most sufferers, a cyst is generally a larger, pus-filled lump that actually resides below the surface of the skin. These cysts are not fleeting symptoms of acne, but can in fact last for weeks or months at a time and may even require the attention of a physician in order to be properly removed. They are often quite similar to a boil and can be quite painful for the average acne sufferer.