Blister on bottom inside lip?

Possibly herpes. Possibly oral herpes (hsv) also known as a fever blister. Another possibility is a canker sore which is different from hsv. Hsv should be treated with an oral antiviral such as acyclovir, valtrex, (valacyclovir) or famvir. Hsv is contagious and there is no cure, it can keep recurring and you are always a carrier. Canker sores are not contagious.

Related Questions

My 4 year old has what looks like a blood blister on lower bottom inside of lip. Should we ask her pediatrician? Been there for a couple months.

Yes. Could be a hemangioma (blood vessel abnormality), or chronic injury from biting her lip, or other cause. Best to get it checked by your pediatrician. Even if it is completely harmless, if it gets in the way of her teeth every time she takes a bite, it will continue to get irritated. Read more...
Ask. It's hard to say what the lesion is without looking at it. However, i would ask your pediatrician to take a look at it. If your pediatrician does not know what it is, then they might refer you to a pediatric dermatologist. Read more...

Small dark purple blister/canker sore inside of bottom lip. What is it??

Hard to say. could be something simple as a minor injury or small viral outbreak such as canker sore or aphthous ulcer but you need to get in with your dentist to make a proper determination. Read more...