I am not going to say what is the right or wrong way as we all have opinions, I know doctors will tell you NOT to pop a blister however I believe most doctors know very little.
I want to make it clear the way I treat my blisters works AMAZING on superficial blisters only, NOT blisters that are extreme or severe. When I say superficial blisters, im talking about blisters that only effect the first layer of skin. Basically the types of blisters we get day to day from working hard, wearing shoes for a short time, or even a burn from touching something hot for a second or two and so forth.
I have had hundreds of blisters in my life time, especially when I was younger from digging and laying bricks. When ever I got a blister I ALWAYS done the following and NEVER got one infected blister by treating them this way,
Start by getting a needle and burn the first third of the needle with a lighter, you will feel the needle get extremely hot within 10 seconds or so, this kills everything on the needle.
I then prick the blister a couple of times while the needle is still hot, most of the fluid will drain fast but give it a gentle squeeze to make sure all the fluid is out,
I then cut the dead skin or the skin that is raised off with small scissors and immediately cover the area with Betadine this keeps the area dry and also sterilized. I DON'T cover the area with anything else just the Betadine as this will keep it dry and allow the skin below to harden and also allows the new skin to grow very fast.
I guarantee you this works wonders and I always worked out side so I often got dirt, sand or mud on the area and never got a infection, keep in mind there is still soft skin where the initial fluid from the superficial blister was. Within a day or two you will have new skin covering the area and totally healing it.
Keep in mind a few facts here, superficial blisters we get from work, or pressure on our feet from shoes, or a slight burn to name a few. These kinds of blisters only effect the top layer of skin, it doesn't effect ALL our skin layers.
Our skin is 2 millimetres thick or 0.07 of a inch thick, so under the fluid in these superficial blisters we still have a second skin layer there albeit very soft tender skin, once the fluid is removed from these superficial blisters it instantly allows the existing skin below to dry and harden up and also allows the new skin layer to grow within a day or two.
If you have blisters from burns that are more severe or even bad sun burn, then TOTALLY ignore what I wrote above.