Cut the skin with sterilized scissors and let the effusion flow out.

Sterilize with iodophor, and then cut off the skin.

The cheapest aspirin (that is, a small bottle 100 tablets of 3 yuan) was smashed into powder.

Aspirin powder is thickly coated,

Wrap the gauze and be careful not to make it airtight.

Wait, if the skin heals easily, it will heal overnight. If it doesn't heal easily or foam repeatedly like me, make bubbles layer by layer several times.