Post epidural numbness

I’m 6 weeks postpartum.

I had some mild discomfort and numbness in my back for about 3 days after I gave birth, and then it felt totally normal.

About a week ago my husband gave me a back rub and since then where I had the epidural my back has been pretty uncomfortable and numb.

I have my 6 week check up with my doctor on Tuesday and I’m going to ask about it, but does anyone have any ideas or similar stories about why it’s feeling like this?