Sycosis Vulgaris and Furunculosis

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Questions and Answers

What is Erythrasma differentiated from?

Psoriasis

Candidiasis

Impetigo

Dermatophytosis (correct)

What is the most common condition that Erythrasma is confused with?

Flexural psoriasis

Dermatophytosis (correct)

Candidiasis

Erysipelas

Which of the following is NOT a differential diagnosis for Erythrasma?

Impetigo (correct)

Dermatophytosis

Kerion

Cellulitis

What is the correct term for the inflammation of subcutaneous tissue?

Cellulitis Signup and view all the answers

Which of the following is a type of fungal infection?

Dermatophytosis Signup and view all the answers

What is the typical duration for untreated impetigo to resolve without scarring?

2 to 4 weeks Signup and view all the answers

What is the characteristic of ecthyma?

A non-bullous impetigo that develops into a necrotic ulcer Signup and view all the answers

What is the difference between ecthyma and untreated impetigo?

Ecthyma develops into a necrotic ulcer, while untreated impetigo does not Signup and view all the answers

What is a common outcome of untreated impetigo?

Resolves on its own without scarring Signup and view all the answers

What is the primary difference between impetigo and ecthyma?

Ecthyma is a type of impetigo that develops into a necrotic ulcer Signup and view all the answers

What is a characteristic of a carbuncle?

Two or more confluent furuncles with separate heads Signup and view all the answers

What is a common predisposing factor for furuncles and carbuncles?

All of the above Signup and view all the answers

What is the typical progression of a boil?

The lesion begins in the hair follicles and often continues for a prolonged period by autoinoculation Signup and view all the answers

What is the primary cause of cellulitis and erysipelas?

Streptococcus pyogenes Signup and view all the answers

What is a characteristic of erysipelas?

A well-demarcated, raised edge Signup and view all the answers

What is the typical treatment for erythrasma?

Topical azole antifungals and oral erythromycin Signup and view all the answers

What is the primary site of involvement in erythrasma?

Intertriginous areas Signup and view all the answers

What is the instrument used to examine erythrasma lesions?

Wood's lamp Signup and view all the answers

Study Notes

Furunculosis / Boils

A boil is an acute, round, tender, and circumscribed follicular staphylococcal abscess that generally ends in central suppuration.
A carbuncle is two or more confluent furuncles with separate heads.
Predisposing factors for boils include:
- Impaired skin surface integrity due to irritation, friction, hyperhidrosis, dermatitis, or shaving.
- Presence of a contagion or autoinoculation from a carrier focus, usually in the nose or groin.
- Systemic disorders such as malnutrition, blood diseases, diabetes, or AIDS.
Boils occur in hair follicles and may continue for a prolonged period by autoinoculation.
Lesions may disappear before rupture, but most undergo central necrosis and rupture through the skin, discharging purulent, necrotic debris.
Commonly affected sites include the face, neck, arm, wrist, fingers, buttocks, and anogenital region.
Treatment for boils involves topical and systemic antibiotics, as well as incision and drainage of some cases.

Cellulitis and Erysipelas

Cellulitis is an infection of the subcutaneous tissue.
Erysipelas is more superficial, involving the dermis and upper subcutaneous tissue.
Both conditions are caused mainly by Streptococcus pyogenes.
Clinical features of cellulitis and erysipelas include:
- Erythema, heat, swelling, and pain or tenderness.
- In erysipelas, the edge of the lesion is well-demarcated and raised, while in cellulitis it is diffuse.
- Blistering and hemorrhage are more common in erysipelas.
- Lymphangitis and lymphadenopathy are frequent.
The face and legs are the most frequent sites affected.
Unusual complications include gangrene, metastatic abscesses, and grave sepsis.
Treatment involves systemic penicillin and cephalosporins.

Erythrasma

Erythrasma is a mild, chronic, localized superficial infection of the skin.
It is more common in adults.
Etiology is Corynebacterium minutissimum.
Predisposing factors include a warm and humid climate, and diabetes mellitus.
Clinical features include:
- Patches (sharply marginated, dry, brown, and slightly scaling) in intertriginous areas.
- Coral red fluorescence on Wood's light examination.
Treatment involves topical azole antifungals or oral erythromycin in extensive cases.

Ecthyma

Ecthyma starts as non-bullous impetigo but develops into a punched-out necrotic ulcer.

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Description

Learn about Sycosis Vulgaris and Furunculosis, including their characteristics, causes, and symptoms. Get ready to test your knowledge on these skin conditions!