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Impetigo is a contagious bacterial infection that involves the superficial skin. [2] The most common presentation is yellowish crusts on the face, arms, or legs. [2] Less commonly there may be large blisters which affect the groin or armpits. [2] The lesions may be painful or itchy. [3] Fever is uncommon. [3]
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Bullous impetigo in newborns, children, or adults who are immunocompromised and/or are experiencing kidney failure, can develop into a more severe and generalized form called staphylococcal scalded skin syndrome (SSSS). The mortality rate is less than 3% for infected children, but up to 60% in adults.
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SSSS is a clinical diagnosis. This is sometimes confirmed by isolation of S. aureus from blood, mucous membranes, or skin biopsy; however, these are often negative. Skin biopsy may show separation of the superficial layer of the epidermis (intraepidermal separation), differentiating SSSS from TEN, wherein the separation occurs at the dermo-epidermal junction (subepidermal separation).
[15] [16] Nonbullous impetigo is the most common form, representing approximately 70% of diagnosed cases. [15] The remaining 30% of cases represent bullous form, which is primarily caused by S. aureus. [15] [17] In rare instances, bullous impetigo can spread and lead to Staphylococcal Scalded Skin Syndrome (SSSS), a potentially life-threatening ...
Pyoderma means any skin disease that is pyogenic (has pus). These include superficial bacterial infections such as impetigo, impetigo contagiosa, ecthyma, folliculitis, Bockhart's impetigo, furuncle, carbuncle, tropical ulcer, etc. [1] [2] Autoimmune conditions include pyoderma gangrenosum.
Superficial pustular folliculitis (impetigo of Bockhart, superficial folliculitis) Sycosis vulgaris (barber's itch, sycosis barbae) Syphilid; Syphilis (lues) Tick-borne lymphadenopathy; Toxic shock syndrome (streptococcal toxic shock syndrome, streptococcal toxic shock-like syndrome, toxic streptococcal syndrome)