Don't pop it, just put a band-aid on it. If it is on your foot, don't wear tight shoes.
If you are going to lance it, avoid infection by cleaning the lance and the blister area well. Never tear the skin off as healthy skin may also be damaged. Just let it dry and fall out itself.
I would get an ice cube and wrap it in cloth or tissue, then hold it to your blister. It might relieve pain.
It's most likely a blister.
same problem except from baseball
A blister on the finger that bleeds should be covered and protected from germs. This may have been caused from a friction rub of gloves, scissors, hand tools or other repetitive hand movements.
You get a needle and hold it over a candle or fire and when it gets really hot pop the blister. The heat is to get the needle sterile. If the blister is in a high-use location, like inside the hand, you can prevent it from tearing open later by inserting the sterilized needle BESIDE the blister and coming up from the underside into the blister, then squeezing the blood or fluid out that way. The top layer of skin lays flat and can actually bond back together instead of splitting open. Good luck!
A fluid-filled raised area on the skin of a finger (or anywhere else on the body) could be a blister. A blister can be caused by a burn or by repeated rubbing, such as blisters on the feet caused by shoes that do not fit correctly.
If the red/purple runs a certain length of your finger then its not getting enough circulation as if a rubber band was tied around it. Otherwise, its most likely a small bruise, or a blood blister.
A blister on the labia
In the context of blister copper, "blister" refers to the appearance of the copper after it is extracted and processed. Blister copper contains gas bubbles that form during the smelting process, giving it a blistered or bubbly appearance.
Blister Agents
Your blister pops...
The blister kept getting bigger and bigger. If you rub that on it'll prevent blisters. A blister is very painful but a blood blister is worse.