Bacteria, such as streptococcus or staphylococcus, are the most common causes of lymphadenitis.

Lymphadenitis from bacterial infections may occur after an injury to the skin. Viral infections can also cause lymphadenitis.

Skin injuries that may lead to lymphadenitis include:

• Animal bites
• Burns
• Cat scratches:
• Cat scratch disease
• Marine stings
• Puncture wounds
• Abrasions
• Lacerations and cuts

Conditions that may cause lymphadenitis include:

• Abscess
• Cancer
• Cellulitis
• Tuberculosis