Cold Sore

Diagnosis

A healthcare provider can usually diagnose cold sores by examining their appearance. In some cases, to confirm the diagnosis, a sample from the blister may be taken and tested in a laboratory.

Treatment

Cold sores often heal on their own within 2 to 4 weeks. However, antiviral medicines may be prescribed to help speed up the healing process.

Common antiviral options include:

• Acyclovir (Zovirax)

• Valacyclovir (Valtrex)

• Famciclovir

• Penciclovir (Denavir)

These medicines are available in different forms. Some are taken as pills, while others are applied as creams to the affected area several times a day. In general, pills tend to work more effectively than creams. For severe infections, antiviral medicines may be given as injections.