If a wound is only causing pain, it can be difficult to determine if it is infected. In general, signs of infection in a wound include increased redness, swelling, and pain, as well as the wound worsening over time. If you notice these symptoms, it is important to seek medical attention promptly to prevent any complications. Remember to keep the wound clean and covered with a bandage, and change it regularly. If the wound was caused by a dirty or rusty object, it may be necessary to get a tetanus vaccine. If in doubt, it is always best to consult a healthcare professional for proper evaluation and treatment.