A wavelike motion felt on palpating a cavity with nonrigid walls, especially one containing fluid. Synonym is fluctuation. (source: Stedman's medical dictionary)
Found on http://www.encyclo.co.uk/visitor-contributions.php


Fluctuance is an indication of the presence of pus in a bacterial infection. As the skin gets infected redness and induration develop. The immune system works to fight off the bacteria and old, spent white blood cells collect in the skin. Certain chemicals given off by bacteria and white blood cells also accumulate under the skin forming pus. Somet...
Found on http://dermatology.about.com/library/bldeffluctuance.htm
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