Local signs that an ulcer has become infected include any or all of the following:
• Base of the ulcer changes from healthy pink granulations to yellowish or grey tissue
• Increased friability of granulation tissue (Fig. 5.4)
• Exudate changes from clear to purulent
• Unpleasant smell
• Edges may become undermined so that a probe can be passed under the skin
• Bone or tendon becomes exposed in the base of the ulcer or can be reached if a probe is passed along a sinus.
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