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PU is an exaggerated pronunciation of pew, an interjection that is appropriate when you smell something foul.
What is pus? Pus is a thick, whitish to yellowish material composed primarily of dead cells that generally forms as a by-product of bacterial infections. The inflammatory cells that participate in the bodyâs immune response at the site of an infection eventually degrade and die, creating the substance known as pus. One of the most common types of bacteria that cause pus formation is Staphylococcus aureus, although any bacterial infection may produce pus. An infection that leads to the production of pus is called a purulent infection. When pus forms within enclosed spaces in the tissues, it causes abscesses. When it forms on the skin surface, it causes lumps known as pustules or pimples.