I took a medication for cold sores (fever blister) and I have 2 small questions: Do I need to apply lip balm?

Yes, you can apply lip balm while healing from a cold sore, as it can protect the skin and promote healing. It is important to use unscented and minimally colored lip balm to avoid irritation. Make sure to apply it with your finger to prevent spreading the virus. Additionally, using a lip balm with sunscreen can provide added protection. Wait at least 30 to 60 minutes after applying any medication before using lip balm. Just remember to reapply the lip balm regularly for continued protection.