Which symptom is indicative of a bacterial infection of the nail?

Discoloration is a key symptom often associated with a bacterial infection of the nail. When bacteria infect the area around or under the nail, they can cause changes in color, which might appear as yellow, green, or even black depending on the type of bacteria involved. This discoloration occurs due to the presence of debris and pus, or simply from the infection itself affecting the nail matrix or surrounding tissue.

While swelling, pain, and itching can also occur with various types of infections, they are not exclusive indicators of a bacterial infection, as they can be seen in fungal infections or irritations as well. Discoloration, on the other hand, is more specific to the presence of bacteria in the nail area, making it a defining symptom for this type of infection. Understanding the significance of discoloration helps in identifying and differentiating infections effectively, which is crucial for appropriate treatment.