Haven’t had a c-section but have had several major surgeries with long incisions. They often cut across nerve fibers in the skin to get to the stuff they need to work on. This usually results in some numbness around the surgery site in your skin for months after the surgery - and over that time it starts to come back as a tingling sensation with some pain (like when your legs falls asleep and starts to wake up, very similar). There can be more pronounced pain as the nerves regrow some months after surgery. 3 years seems like a long time but one of my surgeries is about two years and still feels weird tingly when it gets touched. Probably worth calling the office of the surgeon to see what they say.
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