Children's Hospital Colorado

Mouth Ulcers

Urgent or Emergency Care?

If you believe your child needs immediate attention and you have concerns for a life-threatening emergency, call 911. Not sure what counts as urgent and what's an emergency when your child is sick or injured? When it can't wait, know where to take your kids.

Help Me Decide

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Get to know our pediatric experts.

Michael Narkewicz, MD

Michael Narkewicz, MD

Gastroenterology - Pediatric

Nichole Combest, PA-C

Nichole Combest, PA-C

Physician Assistant

Jilayne Kloote Smith, PNP, RN

Jilayne Kloote Smith, PNP, RN

Certified Pediatric Nurse Practitioner

Thomas Walker, MD

Thomas Walker, MD

Gastroenterology - Pediatric