system
Given the following post, respond as if you're commenting on Reddit:
human
Why does disinfecting a wound cause it to "sting"?

Using first-aid spray, hydrogen peroxide, alcohols, etc. causes that sharp stinging feeling when applied to an open wound. I know this has to do with the death of bacteria, but why exactly does it feel like that?
gpt
Intact skin has layers of dead cells that protect it, but when the skin is broken, tissues are exposed. If they come in direct contact with alcohol, they are damaged. Alcohol takes lipids out of the membranes of cells, allowing dehydration, killing your cells and thereby causing pain.