Cold sores have very recognizable features. They are most often diagnosed by physical exam and by your medical history. If your doctor is not sure, a sample of the fluid or tissue from the blister may be taken. A blood sample may also be taken for testing.
Testing may include any of the following:
Cold sores. Nemours Kids Health website. Available at: http://kidshealth.org/parent/infections/common/cold_sores.html. Updated October 2010. Accessed March 30, 2013.
Herpes labialis. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed/what.php. Updated May 27, 2011. Accessed March 20, 2013.
Herpes simplex: Diagnosis, treatment, and outcome. American Academy of Dermatology website. Available at: http://www.aad.org/skin-conditions/dermatology-a-to-z/herpes-simplex/diagnosis-treatment/herpes-simplex-diagnosis-treatment-and-outcome. Accessed March 20, 2012.
Last reviewed February 2013 by Brian Randall, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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