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Questions and Answers
What is the primary cause of Cellulitis and Erysipelas?
Which of the following is a characteristic of Erythema in Erysipelas?
What is the typical duration of untreated Impetigo?
Which type of Impetigo is associated with scarring?
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What is the typical appearance of blisters in Bullous Impetigo?
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What is the primary difference between Erysipelas and Cellulitis?
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What is a common complication of Erysipelas and Cellulitis?
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Which of the following is a characteristic of Impetigo?
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Which of the following is NOT a characteristic of Cellulitis?
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What is the primary site of infection in Erysipelas?
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Which type of Impetigo is characterized by a punched-out necrotic ulcer?
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What is the common feature of both Erysipelas and Cellulitis?
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Which of the following is a characteristic of Non bullous Impetigo?
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What is the difference in the appearance of the edge of the lesion in Erysipelas and Cellulitis?
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What is the primary bacterium responsible for Cellulitis and Erysipelas?
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Which of the following is a common site affected by Erysipelas and Cellulitis?
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What is the primary difference in the scarring pattern between Ecthyma and Bullous Impetigo?
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What is the primary complication of Erysipelas and Cellulitis?
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Which type of Impetigo is characterized by small vesicles that evolve into flaccid transparent bullae?
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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.
