The festering of the wound caused an infection.

The wound festered and became infected.

The wound festers and becomes infected.

The wound was festeringly infected.

The festerment on his wound was causing him a lot of pain.

The festerments in the jar were causing a foul smell.

The festerings on his arm were a sign of infection.

The festerous wound required immediate medical attention.

The festering wound on his leg required immediate medical attention.

The wound festereth and needs immediate attention.