Hello. Thank you for writing to us I will keep a likely possibility of Herpes Labialis/Cold Sores. Herpes is caused by a virus, herpes simplex virus. Herpes labialis usually presents as a cluster of bumps on or on the area around labial mucosa,. These bumps may later become fluid filled, scab up and ultimately resolve in about a week. Herpes may recur; certain well known stimuli that seems to exacerbate a flare are fever, menstural cycle, stress, exposure to strong sun etc. The frequency of recurrences decreases with time. For an episode of herpes labialis, I usually suggest an Oral antiviral e.g acyclovir or valacyclovir, for my patients of herpes labialis. Oral antivirals are prescription drugs, I suggest that you visit a specialist for a confirmatory diagnosis as well as appropriate prescription. Regards