Could you tell me what's the best treatment for cold sores?

A volatile solvent: Many times a herpetic (cold sore) lesion can be aborted if caught in the premonition phase (when you feel the burning sensation) by the topical application of a volatile solvent such as ether or chloroform. I should be applied topically with a q-tip and sparingly. Dab it with the solvent three or four times and repeat a few hours later. If an ulcer forms, topical antiviral agents are needed.

Your doctor can: prescribe valtrex (valacyclovir). Melissa Officinalis or lemon balm (cream) has been shown in European studies to help expedite cold sore healing. It can reduce healing time by 1/2. Studies also show regular use can help v recurrences. Brief supplementation w lysine 1,000mg orally 3x a day at the onset, can hasten healing. Your dermatologist can provide laser treatments.