Verified answer

This is a superficial second degree burn and does not need medical attention but does require some care. It is important that you do not pop the blister. Keep the area dry and if you can, apply a bandage. It should heal within a week or two and the scarring should be unnoticeable after it heals completely.

I highly doubt the straightener was 500 degrees. She was most likely exaggerating. That's way too hot for a straighter. Most usually go up to about 380 degrees.

Do NOT poke it. That will increase the chances of it getting infected. It will most likely take several weeks to over a month to heal. The bump won't be on your foot forever. Let it heal naturally. Wrap it loosely in gauze and wear shoes that don't irritate it.

do NOT poke or puncture the blister. the liquid inside the blister is your body's best attempt to heal.

to encourage healing, try covering the area with a burn cream.

aloe vera is nice (but make sure you get actual aloe vera, not an alcohol/chemical cocktail with some aloe vera in it). also, "burn stuff" works really well and is available at many drug stores. you can also get vitamin e pills, lance them, and squeeze the clear gel onto the wounded area. in a pinch, classic yellow mustard will work (and as an added bonus will stain everything you own!)

don't dry it out. don't puncture it. don't get it hot.

patience.

oh god, that happened to me once. I burned my arm and there were liquidy fluids inside a bubble. My cousin accidently popped it and now, theres a big scar. It's like blackish brown spot on my hand now. It took like around a few weeks for it to completely heal off.