Our expert says:
A cold sore usually begins with a burning or itching feeling and then develops into a blister that is painful, eventually pops and dries out, making a crust. It is caused by a herpes virus. Zovirax cream kills the virus if put on within 24-48 hours, otherwise spirits of campher works quite well to dry it out.
One can however also get pimples on the lip, then it will start with a red spot, developing a yellow point and will be sore to the touch. Antibiotic cream like Bactroban would help for this.
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