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Any purulent skin disease or any pus forming infection of the skin.

Etiology Pyoderma

An infection of the skin, pyoderma is is seen as an inflammatory destructive disease that is frequently of unknown origin. Bacteria, primarily staphyloccocal (Staphylococci)organisms, may be cultured although in many cases the bacterial cause may be elusive. This is due to the fact that often the bacteria that is cultured is normal resident flora of the skin.

Pyoderma can be divided into the following classifications: surface, superficial, and deep. It is also defined as being of a primary or secondary infection.

Surface pyodermas

are called such because bacteria present on the skin, and involved in the infections, are confined to the surface of the skin.

Primary pyoderma

is often ideopathic in nature (occurring without any predisposing cause), and may be a result of suppressed or compromised immune states. If bacterial infection is involved it is usually one organism as opposed to mixed or more than one organisms such as in deep pyodermas.

Superficial pyoderma

(sometimes seen as a cellulitis affecting the layer of skin at the level of the hair follicle) and secondary pyoderma are often related to other conditions that are present, such as ecto-parasite infestation, fungal infections, atopic or contact type allergic responses, immunologic or endocrine diseases like diabetes, hypothyroidism, or hypoadrenocorticism.

Deep pyodermas

are just as the name suggests, extending well beneath the level of the hair follicle (necrotizing fascitis/flesh-eating disease is a deep pyoderma). Abscesses, tunneling of the skin, ulcerative (and necrotic) lesions, lesions with serosanguinous crusting and pus, and hair loss may be among the signs that are seen.

Excoriated skin lesions vary in size and are often supperative having a sero-sanguinous type of weeping or drainage. Although it is most likely to be seen in areas of the skin that are likely to have the most exposure to warmth and moisture. They can be found on other areas of the body as well. In these areas higher bacteria counts are likely to be seen on culture.

The length of the therapy will be based on successful elimation of whatever is causing the irritant. Pyodermas are difficult to resolve and many tend to reoccur. Treatment tends to be long term.

Pyoderma gangrenosum (PG)

is an uncommon ulcerative cutaneous condition of uncertain etiology. PG was first described in 1930. It is associated with systemic diseases in at least 50% of patients who are affected. The diagnosis is made by excluding other causes of similar appearing cutaneous ulcerations, including infection, malignancy, vasculitis, collagen vascular diseases, diabetes, and trauma. Ulcerations of PG may occur after trauma or injury to the skin in 30% of patients; this process is termed pathergy.

glossary/pyoderma.txt · Last modified: 2012/10/16 14:40 (external edit)