You sat at the park all day on a sunny June day. You forgot your sunscreen and got a pretty bad sunburn. Over the next few days your skin blisters and peels off. But there is new skin under the old damaged skin.
How does that happen?

your body just has extra skin and

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.