Sore on upper lip. Well. please advise.

It looks like you have a viral infection i.e herpes.no need to take any medications just try to avoid contact with it it will resolve in one week to ten days

it is contagious so avoid contact with other persons and your other parts of body

According to the picture provided, it seems like an Herpes infection. Herpes simplex is a viral disease caused by the herpes simplex virus. Infections are categorized based on the part of the body infected. Oral herpes involves the face or mouth. It may result in small blisters in groups often called cold sores or fever blisters or may just cause a sore throat. These typically heal over two to four weeks. Tingling or shooting pains may occur before the blisters appear. Herpes cycles between periods of active disease followed by periods without symptoms. The first episode is often more severe and may be associated with fever, muscle pains, swollen lymph nodes and headaches. Over time, episodes of active disease decrease in frequency and severity. Symptoms: Blisters that break open and form small ulcers, fever, swollen lymph nodes Duration: 2–4 weeks Causes: Herpes simplex virus spread by direct contact Risk factors: Decreased immune function, stress, sunlight, lack of sleep Dental Galaxy, Pune. http://goo.gl/beq3qb

It will get resolved in about 8-10days time. Apply antiseptic or analgesic ointment on the blister.

It is contagious so use separate glass / utensils for eating & drinking.