Increasing redness around the wound
Swelling that is getting worse
Warmth around the wound
Increasing pain or tenderness
Pus or cloudy drainage
Bad smell from the wound
Skin around the wound becoming hard or tight
Red streaks spreading away from the wound
Fever or chills
Delayed healing or the wound getting worse instead of better
Bleeding or drainage that increases after the first day or two
Swollen lymph nodes near the wound
Feeling generally unwell or weak