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A cold sore is a painful blister that appears on the outside of the mouth close to or on the lips. Also known as fever blisters, cold sores develop due to herpes simplex virus type 1 (HSV-1) infections. The HSV-1 virus is highly contagious and spreads through oral contact. While HSV-1 often leads to blisters around the mouth, it can also infect the genitals and lead to genital herpes. Although there is no cure for HSV-1 infections, several treatment options can help reduce the healing time of cold sores and may even prevent them from appearing. Not all cold sores require treatment. Most cold sores heal on their own within 10 days. People should contact a doctor if their cold sore does not improve or worsens after they treat it with OTC or at-home remedies. People should also seek medical treatment if they have: a cold sore that lasts longer than 2 weeks, numerous cold sores at once, a cold sore near their eye, a weakened immune system(Credits: www.medicalnewstoday.com)

Acyclovir is an antiviral drug that people typically take in pill form, and doctors sometimes prescribe it in combination with other medications. It treats certain viral infections, including genital herpes, chickenpox, shingles, and cold sores.  Acyclovir is not a cure for herpes, however the virus remains in the body for a long time and can cause recurring symptoms. The drug instead reduces the virus’s ability to multiply, and this eases symptoms, including pain from sores or blisters. Acyclovir can also help speed healing. It is important to note that acyclovir does not prevent the virus from spreading. Healthcare providers may also use acyclovir to treat common infections in people with HIV. Minor side effects of acyclovir can be easy to manage with home care techniques. A doctor or pharmacist can help provide guidance about managing nausea, vomiting, diarrhoea, and headaches. It is important to note, however, that some over-the-counter medications that can reduce these symptoms may interact with acyclovir. It is generally safe, but people who have kidney disease or are pregnant or breastfeeding should consult a healthcare provider before taking acyclovir(Credits: www.medicalnewstoday.com)