Change in nipple

I have had inverted nipples my whole life, I’m now 40 years old. The last month or so my right nipple has been protruding most of the time. It’s sensitive to the touch and itches, not an itch you can scratch,but a deep itchy burn feeling. I brought it up to my Dr and he said " o, that’s not good, at all. I’d like a mammogram ASAP"  I tried looking up what that could mean but unfortunately inverted nipples are not so common so I can not find anything that talks about inverted to protruding, only protruding to inverted. Has anyone else had an experience with this or maybe knows someone who has?