Hard lumpy feeling in nipple after rads

I’ve got a kind of hard lumpy patch in the lower part of my nipple. I think it may be fibrosis caused by rads - especially as the booster sessions covered that part of the nipple. I finished rads a month ago.
Has anyone else had something like this? If so does it go away gradually? My oncologist said it’s usual to have lumpy feelings after rads but I’m thinking of asking to see the surgeon for a check up and perhaps an ultrasound.
Any advice please?