Surgery scars stinging

I’m 11+1 today, I’ve had multiple surgeries due to endometriosis and have a few scars on my abdomen, one of them being quite low down on my left side, I’ve had a bit of cramping today which feels like stretching but everytime it happens my surgery scar stings so much!! It’s like I have jaggy nettles being scraped over it, really really nippy. Anyone have any idea what causes that?