It burns and itches.
I take some cutlery, heat it on the stove, and rub it on my skin. I leave it really hot, so as soon as I touch it, the autoflexo makes me take it off, hearing the sound of the skin deforming and a little smoke.
Usually the ones I do look like cuts, horizontal and vertical lines. At first it's a sharp pain, which quickly goes away. For a few days, it can continue to throb, a sensation of heat and pulse that continues. It comes and goes. It comes and goes. On a cold night, seeking comfort in the blankets, and it continues to throb. It burns, but it doesn't hurt during that period, it's like it's just a constant warning.
This type is when it just goes away quickly. Once I left a match burning until the flesh turned black. When it burns a lot, you can extinguish the nerve endings from what I know. I don't remember feeling much pain in that case, it was more agony because the sharp pain persisted. However, the after-effect doesn't hurt. But it itches, a lot, and it keeps itching. Later, when it is healing, forming scabs or even peeling off the old skin if it has been burned badly, it will itch a lot.
It is a type of self-harm that takes a lot of attention and focus, I put a lot of effort into it when I need to.