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Pustule
Aka: Pustule, Hemorrhagic Pustule, Necrotic Pustule
- See Also
- Palm and Sole Pustules
- Neonatal Pustules and Vessicles
- Pathophysiology
- Typically develop from Vesicles or bullae that fill with pus, or from Hair Follicles or Sweat Glands
- May also spontaneous form a non-follicular Pustule
- Description
- Raised, translucent superficial, circumscribed skin lesion
- Contains purulent exudate (white, orange, yellow, green)
- Follicular Pustules are conical with hair in center
- Non-follicular Pustules vary in shape
- Differential Diagnosis: Hemorrhagic Pustules (or Necrotic Pustules)
- Disseminated Gonococcal Infection (esp. Palm and Sole Pustules)
- Septic Shock (with Disseminated Intravascular Coagulation)
- Disseminated Nocardia
- Pyoderma Gangrenosum
- Smallpox
- Ecthyma gangrenosum
- Labs
- Gram Stain and culture of pustular discharge (exclude disseminated Gonorrhea)
- Examples
- Drug eruption
- Acne Vulgaris
- Generalized Pustular Psoriasis syndrome
- Viral vessicular eruptions may develop into Pustules (e.g. varicella, Herpes Zoster virus, Herpes Simplex Virus)