Sandbox/00026

• Cellulitis

• Cellulitis is an acute, subacute, or chronic inflammation of loose connective tissue, but the term has been applied mainly to inflammation of subcutaneous tissue in which an infective cause is proven or assumed.

• Erysipelas

• Erysipelas is a bacterial infection of the dermis and upper subcutaneous tissue hallmarked by a well-defined, raised edge reflecting the more superficial (dermal) involvement.

• Impetigo

• Impetigo is a contagious superficial pyogenic infection of the skin.

• Non-bullous impetigo (or impetigo contagiosa of Tilbury Fox)
• Bullous impetigo

• 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.

• 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.