If you have a cold sore, there are a couple of things you need to avoid doing that involve both what you do to yourself and what you do to others. Most importantly, do not kiss a baby if you have a cold sore as this could put them at risk of developing neonatal herpes, which can be very dangerous for a newborn.
Other things to avoid are kissing anyone, performing oral sex, sharing water bottles, toothbrushes, vapes – basically anything that touches your mouth. You should avoid touching the cold sore, except to apply cream – and remember to wash your hands both before and after to limit contamination. Salty and acidic foods can also aggravate your cold sore, so it’s best to stick to cool, soft foods.