I have this blister and im not sure what it is?

Nor can we. If you uploaded any pictures be aware that this public information site does not allow us access to anything in your file. We can only comment on what you write in your post. You can go to www.connect@healthtap.com and arrange a paid consult with a doctor that can access your uploads.

Where is the blister? Is there only one or multiple? Do you have fever? If the blister is around your mouth it is likely a cold sore and will heal on its own. Get HPV, Flu and Covid vaccines. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines