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Risk factors

By Mayo Clinic staff

About 90 percent of adults worldwide — even those who've never had symptoms of an infection — test positive for evidence of the virus that causes cold sores.

People who have weakened immune systems are at higher risk of complications from the virus. Medical conditions and treatments that increase your risk of complications include:

  • HIV/AIDS
  • Eczema
  • Severe burns
  • Cancer chemotherapy
  • Anti-rejection drugs for organ transplants
Complications Causes
References
  1. Habif TP. Clinical Dermatology: A Color Guide to Diagnosis and Therapy. 5th ed. Edinburgh, U.K.; New York, N.Y.: Mosby Elsevier; 2010. http://www.mdconsult.com/books/about.do?about=true&eid=4-u1.0-B978-0-7234-3541-9..X0001-6--TOP&isbn=978-0-7234-3541-9&uniqId=230100505-57. Accessed March 9, 2012.
  2. Herpes simplex. American Academy of Dermatology. http://www.aad.org/skin-conditions/dermatology-a-to-z/herpes-simplex. Accessed March 9, 2012.
  3. Ferri FF. Ferri's Clinical Advisor 2012: 5 Books in 1. Philadelphia, Pa.: Mosby Elsevier; 2012. http://www.mdconsult.com/books/about.do?about=true&eid=4-u1.0-B978-0-323-05611-3..C2009-0-38601-8--TOP&isbn=978-0-323-05611-3&uniqId=291436269-101. Accessed March 9, 2012.
  4. Klein RS. Clinical manifestations and diagnosis of herpes simplex virus type 1 infection. http://www.uptodate.com/index. Accessed March 9, 2012.
  5. Kliegman RM, et al. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa.: Saunders Elsevier; 2011. http://www.mdconsult.com/das/book/body/208746819-6/0/1608/0.html. Accessed March 9, 2012.
  6. Goldman L, et al. Cecil Medicine. 24th ed. Philadelphia, Pa.: Saunders Elsevier; 2011. http://www.mdconsult.com/das/book/body/191371208-2/0/1492/0.html#. Accessed March 9, 2012.
  7. Klein RS. Epidemiology of herpes simplex virus type 1 infection. http://www.uptodate.com/index. Accessed March 16, 2012.
  8. Wolff K, et al. Fitzpatrick's Color Atlas and Synopsis of Clinical Dermatology. 6th ed. New York, N.Y.: The McGraw-Hill Companies; 2009. http://www.accessmedicine.com/resourceTOC.aspx?resourceID=45. Accessed March 16, 2012.
  9. Klein RS. Treatment of herpes simplex virus type 1 infection in immunocompetent patients. http://www.uptodate.com/index. Accessed March 16, 2012.
  10. Cold sores. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed March 19, 2012.
  11. Rakel RE. Textbook of Family Medicine. 8th ed. Philadelphia, Pa.: Saunders Elsevier; 2011. http://www.mdconsult.com/das/book/body/191205553-4/0/1481/0.html#. Accessed March 19, 2012.
DS00358 May 23, 2012

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