Acne Classification
Though all
pimples start the same way, they can take many forms
and may react differently for different people. All
acne begins with one basic lesion: The comedo, an
enlarged hair follicle plugged with oil and bacteria.
Invisible to the naked eye, the comedo lurks beneath
the surface of your skin waiting for the right
conditions to grow into an inflamed lesion. As the
skin continues to produce more oil, bacteria
flourishes within the swollen follicle. The
surrounding skin becomes increasingly inflamed as your
white blood cells fight against the intruders.
NOTE:
The following guide is not intended to be used for
conclusive self-diagnosis; it’s best to consult a
dermatologist if your acne persists. These
definitions may be used to help you decide whether or
not you should consider seeking medical attention.
NON-INFLAMMATORY ACNE
Closed
comedo, or whitehead. If the plugged follicle
stays below the surface of the skin, the lesion is
called a closed comedo, or whitehead. They usually
appear on the skin as small, whitish bumps.
Open
comedo, or blackhead. If the plug enlarges and
pushes through the surface of the skin, it's called an
open comedo, or blackhead. The plug's dark appearance
is not due to dirt, but rather to a buildup of
melanin, the skin's dark pigment.
INFLAMMATORY ACNE
Papule.
The mildest form of inflammatory acne is the papule,
which appears on the skin as a small, firm pink bump.
These can be tender to the touch, and are often
considered an intermediary step between
non-inflammatory and clearly inflammatory lesions.
Pustule. Like papules, pustules are small round
lesions; unlike papules, they are clearly inflamed and
contain visible pus. They may appear red at the base,
with a yellowish or whitish center. Pustules do not
commonly contain a great deal of bacteria; the
inflammation is generally caused by chemical
irritation from sebum components such as fatty free
acids.
Nodule
or Cyst. Large and usually very painful,
nodules are inflamed, pus-filled lesions lodged deep
within the skin. Nodules develop when the contents of
a comedo have spilled into the surrounding skin and
the local immune system responds, producing pus. The
most severe form of acne lesion, nodules may persist
for weeks or months, their contents hardening into a
deep cyst. Both nodules and cysts often leave deep
scars.
Acne
conglobata. This rare but serious form of
inflammatory acne develops primarily on the back,
buttocks and chest. In addition to the presence of
pustules and nodules, there may be severe bacterial
infection. |