I used to have a squishy lump on my wrist...?

I never heard of it and never seen it either and even your doctor didn't know but at least he took care of it and it went away . What it is is what your doctor has explained to you , nerves and tendons and so . What was the cause is what you are looking for and I believe that he knew but perhaps didn't want to explained in detail . I am not sure you will find it here on the internet unless you happen to get it from an expert who diagnose without looking at the problem . Good luck and take care