Macchia chiara/scura su di una foglia

Small isolated blemish, most probably due to mechanical damage when young..........nothing to worry about. It is not caused by deficiencies of any sort, nor does it look like a pest issue. Remember too........no plant will ever have 100% perfect leaves, 100% of the time.

hey 👋 unlikely, but still, check for small pests like leafhoppers or aphids, especially under the leaf. Give it a little shake ; if nothing moves, no worries 😉

looks like a bit of damage. Maye some water got on a baby lead and burned it a bit when it was growing out. or something damaged it from moving around, does not look pest related. I would not worry about it.

could be Ca def