| Deep
pyogenic Infection (Cellulitis):
Cellulitis
is a diffuse inflammation of the connective tissue of the skin and
deeper soft tissue.
Erysipelas:
Form of
cellulitis. Subepidermal edema with formation of vesiculobullous
lesion. There may be a dense diffuse neutrophilic infiltrate and in
some cases vascular and lymphatic dilatation.
Necrotizing
fasciitis:
(Flesh eating
bacteria). Rare form of cellulitis, usually located on the leg. It
progresses to necrosis of skin and underlying tissues and may spread
into the underlying muscle. Histologicallly there isnecrosis of the
epidermis, dermis and upper subcutis. There is septic vasculitis with
inflammation of the vessel wall. Thrombi may be present in the lumen.
Clostridial myonecrosis
(Gas gangrene) 
Blastomycosis-like pyoderma |
