Inflammation usually appears within 5-14 days of the operation, sometimes even 4-5 weeks later. It may range from a mild reddening of the skin through purulent discharge even to serious skin infection, which could end in tissue necrosis. Basically, there are two causes of inflammation: one is bacteria from outside when treating the wound during the operation or post-operative, the second is failing to follow the doctor's instructions, removing or soaking the bandage, therefore infecting the operated area.
The bacteria in the normal flora of a healthy skin may also be the source of a serious inflammation, since when getting into the wound and the underlying tissues - greatly enhanced by soaked - through bandage and the nearby wound area - the bacteria may multiply and cause purulent inflammation.
The first cause is rarer than the second, since before the operation we cannot sterilize the skin so thoroughly - without hurting the surface of the skin - that not a single bacterium should remain. The immune system of the body, however, easily combats the few bacteria that get into the wound. A problem arises only when the immune protection of the body is weaker or the bacteria are more virulent than normally. In most cases we are able to control the situation by opening the wound and draining the purulent fluid. There may only be a problem with the wound healing, since the opened area leaves a wider scar later. With some types of operations, however, such as breast augmentation, the above inflammation may mean a complete failure of the operation and there is a need to remove the implant in almost all cases.