H2O is a nice stable chemical. It’s very happy being H20.
If you shove an extra oxygen atom on to it, it doesn’t like that. It wants to get rid of the extra oxygen atom and go back to being H2O.
Because it wants to get rid of the oxygen atom, if it comes into contact with a chemical that can accept a new oxygen atom, it will probably pass the oxygen atom across. This will change the other chemical. If the other chemical is part of your skin, that will hurt.
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