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  • Cellulitis
  • Cellulitis is an acute, spreading pyogenic inflammation of the dermis and subcutaneous tissue, usually complicatinga wound, ulcer, or dermatosis.[1]
  • Erysipelas
  • Erysipelas is a superficial infection of the dermis and upper subcutaneous tissue with prominent lymphatic involvement, presenting with an indurated, "peau d’orange" appearance with a raised border that is demarcated from uninvolved skin.[1]
  • Impetigo
  • Impetigo is a contagious superficial pyogenic infection of the skin, that usually begins as vesicles with a very thin, fragile roof consisting only of stratum corneum.
  • Bullous impetigo
  • Non-bullous impetigo (or impetigo contagiosa of Tilbury Fox)


  • Ecthyma
  • Ecthyma is a pyogenic infection of the skin characterized by the formation of adherent crusts, beneath which ulceration occurs.
  • Furuncle (boil)
  • Furuncle is an acute, usually necrotic, infection of a hair follicle with Staphylococcus aureus.
  • Carbuncle
  • Carbuncle is a deep infection of a group of contiguous follicles with Staphylococcus aureus, accompanied by intense inflammatory changes in the surrounding and underlying connective tissues, including the subcutaneous fat.
  • Sycosis
  • Sycosis is a subacute or chronic pyogenic infection involving the whole depth of the follicle.
  • Lupoid sycosis (ulerythema sycosiforme): sycosis in which the follicles are destroyed with clinically evident scarring.
  • Folliculitis decalvans: sycosis involving the scalp.
  • Erythrasma
  • Erythrasma is a mild, chronic, localized superficial infection of the skin caused by a group of closely related aerobic coryneform bacteria, usually known as Corynebacterium minutissimum.


  • Dermatitis vegetans (pyoderma vegetans)
  • Dermatitis vegetans is a condition of uncertain etiology characterized by the development of epithelial hyperplasia and chronic granulomatous changes.


  • Perifolliculitis capitis (abscedens et suffodiens; dissecting cellulitis of the scalp)
  • Perifolliculitis capitis is a rare, chronic, suppurative disease of the scalp.


  • Suppurative hidradenitis (apocrinitis; hidradenitis suppurativa)
  • Suppurative hidradenitis is a chronic relapsing inflammatory disease originating in apocrine gland follicles, which may become chronic and often indolent due to subcutaneous extension with induration, scarring, destruction of skin appendages and sinus formation.


  • Erysipeloid
  • Erysipeloid is an acute, rarely chronic, infection with Erysipelothrix rusiopathiae.


  • Pseudofolliculitis (pili incarnati)
  • Pseudofolliculitis is an inflammation due to penetration into the skin of sharp tips of shaved hairs.

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References

  1. 1.0 1.1 Swartz MN (2004). "Clinical practice. Cellulitis". N Engl J Med. 350 (9): 904–12. doi:10.1056/NEJMcp031807. PMID 14985488.
  2. Rook, Arthur (2010). Rook's textbook of dermatology. Chichester, West Sussex, UK Hoboken, NJ: Wiley-Blackwell. ISBN 1405161698.