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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.

PubMed Health Glossary
(Source: Wikipedia)

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 Cysts
Deep, painful, pus-filled lesions that can cause scarring.
Acne Lesions
A pattern of blemishes in an area of skin resulting from the skin condition.
Acne Nodules
Large, painful, solid lesions that are lodged deep within the skin.
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.
Inflammation
Redness, swelling, pain, and/or a feeling of heat in an area of the body. This is a protective reaction to injury, disease, or irritation of the tissues.
Lesion
A lesion is any abnormality in the tissue of an organism ("damage"), usually caused by disease or trauma.
Melanin
A pigment that gives color to skin and eyes and helps protect it from damage by ultraviolet light.
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.
Papules
A small, solid, raised bump on the skin that has a border with edges that are easy to see. Papules may be red, purple, brown, or pink.
Pilosebaceous Unit
The structure consisting of hair, hair follicle, arrector pili muscle and sebaceous gland.
Pores in the Skin
A tiny opening in the skin.
Propionibacterium Acnes (P. acnes)
Bacteria isolated from normal skin, intestinal contents, wounds, blood, pus, and soft tissue abscesses.
Pustules (Pimples)
A pimple filled with pus.
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 Cysts
Deep, painful, pus-filled lesions that can cause scarring....
Acne Lesions
A pattern of blemishes in an area of skin resulting from the skin condition....
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