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Microcomedones

A comedo is a clogged hair follicle (pore) in the skin. This small plug is called a microcomedo. If sebum continues to build up behind the plug, it can enlarge and form a visible comedo.

PubMed Health Glossary
(Source: Wikipedia)

Illustrations of types of acne lesions Click to enlarge

Three types of acne lesions in detail National Institutes of Health

About Microcomedones

Acne is a disorder that affects the skin's oil glands and hair follicles. The small holes in your skin (pores) connect to oil glands under the skin. These glands make an oily substance called sebum. The pores connect to the glands by a canal called a follicle. Inside the follicles, oil carries dead skin cells to the surface of the skin. A thin hair also grows through the follicle and out to the skin.

Sometimes, the hair, sebum, and skin cells clump together into a plug. The bacteria in the plug cause swelling. Then when the plug starts to break down, a pimple grows. NIH - National Institute of Arthritis and Musculoskeletal and Skin Diseases

Terms to know

Acne
A chronic disorder associated with an increase in sebum secretion. It is characterized by open comedones (blackheads) and closed comedones (whiteheads).
Acne Lesions
A pattern of blemishes in an area of skin resulting from the skin condition.
Bacteria
A large group of single-cell microorganisms. Some cause infections and disease in animals and humans. The singular of bacteria is bacterium.
Closed Comedones (Whiteheads)
A comedo is a clogged hair follicle (pore) in the skin. Keratin (skin debris) combines with oil to block the follicle. A comedo can be open (blackhead) or closed by skin (whitehead), and occur with or without acne.
Comedones
A comedo is a clogged hair follicle (pore) in the skin. A comedo can be open (blackhead) or closed by skin (whitehead), and occur with or without acne. The plural of comedo is comedones.
Hair Follicle
The hair follicle is a tube-shaped sheath that surrounds the part of the hair that is under the skin and nourishes the hair.
Keratinocytes
Cell type in the epidermis, the outermost layer of the skin. The primary function of keratinocytes is the formation of a barrier against environmental damage.
Open Comedones (Blackheads)
A comedo is a clogged hair follicle (pore) in the skin. A comedo can be open (blackhead) or closed by skin (whitehead). Being open to the air causes oxidization, which turns it black.
Pilosebaceous Unit
The structure consisting of hair, hair follicle, arrector pili muscle and sebaceous gland.
Sebaceous Glands (Oil Glands)
Small glands located within the epidermis, and associated with the hair follicle, that produce and secrete an oily substance that lubricates the skin and hair.
Sebum (Oil)
An oily substance produced by certain glands in the skin.
Skin
The outer covering of the body that protects it from the environment.

Related conditions

Terms to know

Acne
A chronic disorder associated with an increase in sebum secretion. It is characterized by open comedones (bla...
Acne Lesions
A pattern of blemishes in an area of skin resulting from the skin condition....
Bacteria
A large group of single-cell microorganisms. Some cause infections and disease in animals and humans. The sin...
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