How does one tell people not to kiss your baby?

First off, both me and my husband get cold sores on our lips. We both got it as kids from our parents. I have a weaker immune system due to health reasons and I get them very easily. I would never wish this upon anyone as it is embarrassing and painful. I am pregnant and I know what precautions I will be taking to make sure my children don’t get it.

But... I have not seen my family in a year (moved across the country) and it will be another year until I am able to see them at which point baby will be here. My big concern is everyone will want to kiss baby when they see him/her. I know my friends will respect not kissing baby, but how am I supposed to tell my family not to? They would find it SO rude. Plus 80% of my family get cold sores including my dad. This will be the very first grandbaby out of all the cousins(and there’s a lot).

I’m such a shy and overly nice person that can never stick up for myself and I know that will need to change... but I need ideas on how to tell them because it driving me crazy.