If the wound has crusted over and pus accumulates under the crust, if left untreated, the bacteria in the pus can lead to the expansion of the infected lesion, such as the appearance of redness, swelling, heat and pain such as flushing of the skin around the wound and increased skin temperature. If the infection is further aggravated, it may affect the deeper tissues under the skin, which may lead to the possibility of having cellulitis. In addition, it may also lead to abscesses in the subcutaneous soft tissues, resulting in localized bulging, and if the abscesses rupture, it may also lead to pus flow from the deep soft tissues. There is also a risk that the wound may gradually ulcerate deeper, leading to chronic, refractory ulcers.