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Various types of wound drainage are common during the healing process. Most of the time, the discharge produced by the wound is blood-tinged, or serous fluid. Serous fluid is normal for wounds that are healing and has been there for a long time. Occasionally, however, excessively large amounts of serous fluid will appear and may need immediate medical attention. Here are some signs of abnormal drainage from the skin. These discharges should be investigated by a medical professional.

Often called "pus," this thick liquid is usually a sign of infection and is not characteristic of normal wound healing. It contains dead bacteria, white blood cells, and other inflammatory cells. Purulent drainage can increase the inflammatory response, but it does not mean that the wound is infected. All forms of drainage are characterized by the presence of bacteria. These bacteria feed on the byproducts of the tissue and produce the foul odor that makes the area smell.

Unlike blood plasma, wound drainage contains a variety of bacteria, viruses, and other harmful pathogens. It is similar to the contents of the human body's blood. A typical collection of exudate consists of a mixture of water, proteins, inflammatory mediators, and electrolytes. The white blood cells help clean the wound and kill pathogenic microorganisms, while the other components of the fluid provide nutrients for the skin to repair itself. It also serves as a medium for the migration and cellular division of epithelial cells.

The drainage from wounds should be examined for two main types. Serosanguinous drainage is pink and watery. The other type is called purulent drainage. The latter is thick and contains white blood cells, microorganisms, and bacteria. A smelly purulent drainage is usually an indicator of an infection. In some cases, pus may be visible in the serum. If it's thick, it can indicate that there's an infection.

A serosanguinous drainage is the most common type of wound exudate. It is milky, watery, and pink. A purulent drainage is yellow, green, or gray and may be thick and milky. When serosanguinous drainage is excessive, it is a sign of infection. It is important to consult a doctor if the drainage is unusual. It is common for doctors to diagnose a bacterial infection.

Low vacuum drainage is the most common type of wound draining. It's also the safest way to prevent post-operative infection. It reduces post-operative swelling and pain. Unlike conventional wound drainage, closed wound drainage reduces post-operative infections and is also the most common type of drainage. Its main components include a PVC bellow, a stainless steel trocar, and connection tubing. A high-vacuum set can provide sufficient suction.