Impetigo Infections

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Questions and Answers

What is the primary cause of Cellulitis and Erysipelas?

Staphylococci

Viral infections

Fungi

Streptococcus pyogenes (correct)

Which of the following is a characteristic of Erythema in Erysipelas?

Diffuse edge of the lesion

Well-demarcated and raised edge of the lesion (correct)

-vesicle formation

Painful and tender lesions

What is the typical duration of untreated Impetigo?

1-2 weeks

4-6 weeks

More than 6 weeks

2-4 weeks (correct)

Which type of Impetigo is associated with scarring?

Ecthyma Signup and view all the answers

What is the typical appearance of blisters in Bullous Impetigo?

Small, flaccid, and transparent Signup and view all the answers

What is the primary difference between Erysipelas and Cellulitis?

Depth of tissue involvement Signup and view all the answers

What is a common complication of Erysipelas and Cellulitis?

All of the above Signup and view all the answers

Which of the following is a characteristic of Impetigo?

Honey-coloured crusted erosions Signup and view all the answers

Which of the following is NOT a characteristic of Cellulitis?

Well-demarcated edge of the lesion Signup and view all the answers

What is the primary site of infection in Erysipelas?

Dermis and upper subcutaneous tissue Signup and view all the answers

Which type of Impetigo is characterized by a punched-out necrotic ulcer?

Ecthyma Signup and view all the answers

What is the common feature of both Erysipelas and Cellulitis?

Erythema, heat, swelling, and pain Signup and view all the answers

Which of the following is a characteristic of Non bullous Impetigo?

Honey-coloured crusted erosions Signup and view all the answers

What is the difference in the appearance of the edge of the lesion in Erysipelas and Cellulitis?

Erysipelas has a well-demarcated edge, while Cellulitis has a diffuse edge Signup and view all the answers

What is the primary bacterium responsible for Cellulitis and Erysipelas?

Streptococcus pyogenes Signup and view all the answers

Which of the following is a common site affected by Erysipelas and Cellulitis?

Face and legs Signup and view all the answers

What is the primary difference in the scarring pattern between Ecthyma and Bullous Impetigo?

Ecthyma heals with scarring, while Bullous Impetigo heals without scarring Signup and view all the answers

What is the primary complication of Erysipelas and Cellulitis?

All of the above Signup and view all the answers

Which type of Impetigo is characterized by small vesicles that evolve into flaccid transparent bullae?

Bullous Impetigo Signup and view all the answers

Study Notes

Impetigo

Impetigo is a contagious superficial pyogenic infection of the skin caused by staphylococci and streptococci
Characterized by pustules and honey-coloured crusted erosions ("school sores")
More common in children and occurs mostly during summer
Three types of impetigo:
Non-Bullous Impetigo
- Starts as a pink macule that evolves into a vesicle or pustule and then into crusted erosions
- Untreated, it usually resolves within 2-4 weeks without scarring
Ecthyma
- Starts as non-bullous impetigo but develops into a punched-out necrotic ulcer
- Heals slowly, leaving a scar
Bullous Impetigo
- Presents with small vesicles that evolve into flaccid transparent bullae
- Heals without scarring

Cellulitis and Erysipelas

Cellulitis is an infection of the subcutaneous tissue
Erysipelas is more superficial, involving the dermis and upper subcutaneous tissue
Cellulitis and erysipelas may overlap, with cellulitis extending superficially and erysipelas deeply
Caused mainly by Streptococcus pyogenes
Clinical features:
- Erythema, heat, swelling, and pain or tenderness
- In erysipelas, the edge of the lesion is well-demarcated and raised, but in cellulitis, it is diffuse
- Blistering and hemorrhage are more common in erysipelas
- Lymphangitis and lymphadenopathy are frequent
- Face and legs are the most frequent sites affected
Unusual complications:
- Gangrene
- Metastatic abscesses
- Grave sepsis

Bacterial Skin Infections

Bacterial skin infections are contagious and superficial, caused by staphylococci and streptococci.
Characterized by pustules and honey-colored crusted erosions, often referred to as "school sores".
More common in children, typically occurring during summer.

Types of Impetigo

Non-bullous impetigo:
- Starts as a pink macule, evolving into a vesicle or pustule, and then into crusted erosions.
- Untreated, it resolves within 2-4 weeks without scarring.
Ecthyma:
- Starts as non-bullous impetigo, but develops into a punched-out necrotic ulcer.
- Heals slowly, leaving a scar.
Bullous impetigo:
- Presents with small vesicles that evolve into flaccid transparent bullae.
- Heals without scarring.

Cellulitis and Erysipelas

Cellulitis: an infection of the subcutaneous tissue.
Erysipelas: more superficial, involving the dermis and upper subcutaneous tissue.
Both can overlap, with cellulitis extending superficially and erysipelas deeply.
Caused mainly by Streptococcus pyogenes.

Clinical Features

Erythema, heat, swelling, and pain or tenderness are constant features.
Erysipelas: well-demarcated and raised lesion edges, whereas cellulitis has diffuse edges.
Blistering and hemorrhage are more common in erysipelas.
Lymphangitis and lymphadenopathy are frequent.
Face and legs are the most frequently affected sites.

Complications

Gangrene
Metastatic abscesses
Grave sepsis

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Description

A contagious skin infection caused by staphylococci and streptococci, characterized by pustules and honey-coloured crusted erosions. It's more common in children and occurs mostly during summer.