Testing & Diagnosis for Canker Sores (Aphthous Stomatitis) in Children

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If you child sees a physician for her canker sores, doctors usually diagnose them based on a complete history and physical examination of your child. The lesions are unique and usually your child's physician can make a simple physical diagnosis. In addition, you child's physician may order the following tests to help confirm the diagnosis and rule out other causes for the ulcers:

  • blood tests
  • cultures of the lesions
  • biopsy of the lesion - taking a small piece of tissue from the lesion and examining it microscopically
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