What is square shaped burning sensation post hernia surgery on skin post surgery?

Hernia pain. Where? What kind of hernia (you can have them all over your body)? Sometime pain like that can come from a stitch that is pinching or pulling on a cutaneous nerve. Sometimes it's just from the healing process. If not better in a few weeks, see your surgeon.
Nerve irritation. It sounds like a nerve is irritated following surgery (hypersthesia). Use a vitamin e cream and it should improve.

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