- Cellulitis (see Cellulitis, [[Cellulitis]]): skin infection of deeper dermis and subcutaneous fat (resulting from bacterial breach of the skin) characterized by erythema, warmth, and edema without an underlying suppurative focus
- Erysipelas (see Erysipelas, [[Erysipelas]]): skin infection of upper dermis and superficial lymphatics (resulting from bacterial breach of the skin) characterized by erythema, warmth, and edema without an underlying suppurative focus
- Impetigo: infection of superficial layers of the epidermis
- Necrotizing Fasciitis (see Necrotizing Fasciitis, [[Necrotizing Fasciitis]]): deep-seated infection of subcutaneous tissue (involving fascia and fat), which may spare the skin
- Furuncle (Boil) (see Skin Abscess, [[Skin Abscess]]): infection of hair follicle where purulent material extends through the dermis into the subcutaneous tissue, forming a small abscess
- Carbuncle (see Skin Abscess, [[Skin Abscess]]): coalescence of several inflamed follicles into a single inflammatory mass with purulent drainage from multiple follicles
- Skin Abscess (see Skin Abscess, [[Skin Abscess]]): collection of pus within dermis and deeper skin tissues
Impetigo is an acute, highly contagious gram-positive bacterial infection of the superficial layers of the epidermis. Skin lesions such as cuts, abrasions, and chickenpox can also become secondarily infected (impetiginized) with the same pathogens that produce classic impetigo.
Impetigo occurs most commonly in children, especially those who live in hot, humid climates. The name is believed to be derived from the Latin impetere (to assail).
Impetigo occurs in 2 forms: bullous and nonbullous, as shown in the photographs below. Nonbullous impetigo is the more common form, constituting approximately 70% of impetigo cases. It tends to affect skin on the face or extremities that has been disrupted by bites, cuts, abrasions, other trauma, or diseases such as varicella.
- Staphylococcus Aureus (see Staphylococcus Aureus, [[Staphylococcus Aureus]])
- Streptococcus Pyogenes (Group A Streptococcus) (see Streptococcus Pyogenes, [[Streptococcus Pyogenes]])
- Bullous Impetigo (see Vesicular-Bullous Skin Lesions, [[Vesicular-Bullous Skin Lesions]])