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Questions and Answers
Which bacteria commonly cause impetigo?
Which bacteria commonly cause impetigo?
- P. aeruginosa
- S. aureus (correct)
- Group B streptococci
- Group A streptococci (correct)
What is a defining characteristic of erysipelas?
What is a defining characteristic of erysipelas?
- It involves deep tissue necrosis
- It is primarily caused by staphylococci
- It affects only children
- It presents with well defined, spreading erythematous inflammation (correct)
What is the most common causative agent of folliculitis associated with areas of friction?
What is the most common causative agent of folliculitis associated with areas of friction?
- P. aeruginosa
- S. epidermidis
- C. acnes
- S. aureus (correct)
Which feature is NOT associated with impetigo?
Which feature is NOT associated with impetigo?
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What typically weeps serous fluid among the listed infections?
What typically weeps serous fluid among the listed infections?
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Epidermal erosion with elevated margins is a characteristic of?
Epidermal erosion with elevated margins is a characteristic of?
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What causes folliculitis after exposure to swimming pools or hot tubs?
What causes folliculitis after exposure to swimming pools or hot tubs?
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Which population is primarily affected by erysipelas?
Which population is primarily affected by erysipelas?
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Study Notes
Skin Infections
Impetigo
- Characterized by fragile, pinhead-sized vesicles or pustules that rupture early, forming rapidly enlarging and spreading erosions with bright yellow crusts.
- Crusts have elevated margins and are attached in the center.
- Spreading infection limited to the epidermis presents as a bullous, crusted, or pustular eruption of the skin.
- Lesions may weep a serous fluid.
Erysipelas
- A contagious disease of skin and subcutaneous tissue, marked by redness and swelling accompanied by vesicular and bullous lesions.
- Almost always caused by group A streptococci.
- Typically occurs on the cheek.
- Seen primarily in children and the elderly.
- Characteristics: blocking of dermal lymphatics, presenting as a well-defined, spreading erythematous inflammation.
- Often accompanied by pain and fever.
Folliculitis
- A group of skin conditions in which there are inflamed hair follicles.
- Results in a tender red spot, often with a surface pustule.
- Can affect anywhere there are hairs, including the chest, back, arms, and legs.
- Usually caused by S. aureus.
- Often associated with areas of friction and sweat gland activity.
- Most frequently seen on the neck, face, and axillae.
- Infection with P. aeruginosa can occur after exposure to inadequately chlorinated water in swimming pools or hot tubs.
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