Hello,
Thanks for posting your query at DoctorSpring.com
I can understand your concern. I reviewed the picture. Its not clearly visible. But from what i can appreciate its a fever blister or a cold sore.
I would recommend application of Mupirocin cream twice a day for a week. Also you can take antiviral medication called valacyclovir which will require a prescription.
Please let me know if you have any queries.
Take care