Cold sores, or fever blisters, are a cluster of tiny sores developing on and around the lips. These sores are typically painful, beginning with an itching or burning sensation and eventually swelling up and reddening. Cold sores are typically caused by the herpes simplex virus (HSV), which spreads through activities involving close physical contact. Although cold sores do not have a specific cure, their frequency may be controlled with some basic remedies: Apply apple cider vinegar Research studies suggest that applying apple cider vinegar can help the body protect itself from bacteria, germs, and viruses. Further, apple cider vinegar can help eliminate dead skin cells from the body, contributing to a quicker healing process. Use cold compress Using a cold compress is one of the best cold sores remedies to reduce swelling and inflammation and provide pain relief. One may also wrap a muslin cloth around an ice cube and place it on the affected area to relieve cold-sore symptoms. Invest in a good sunscreen and lip balm Exposure to direct sunlight can trigger or aggravate cold sores. However, as one cannot avoid stepping out during the day, applying good sunscreen with an SPF of at least 30 can help prevent such flare-ups.