That sounds to me like you may have just gotten a blister. They come back a little crusty sometimes. I’d recommend going to the dermatologist, there are a lot of great ways to clear up acne with special medical care! There are also some helpful over the counter creams and medications. It doesn’t sound like any kind of skin condition, but you would be able to confirm or deny that if you went to the dermatologist.
Hope that helped! :)
The AV valves close first, then the semilunars open and close, then the AV valves open
All the essential nutrients can be found in a vegetarian diet! (Coming from a vegetarian herself :))
Another term for this classification of drugs is sedatives.
B. Depressants