I can only tell you what I know and each person and their doctor is different. I first noticed my first nodule about 17 months ago. I now have 3 on my left foot and two small and I huge on my right foot. I can feel them in any shoes with arch supports. I have had 3 cortisone shots in the bigger one on the left foot. They grow and stop growing as they please. The cortisone can sometimes slow the growth...sometimes! I had mine diagnosed clinically (by my doctor) but then he also ordered an MRI which gave the definitive diagnosis with even the measurements of the nodules. I think one was 9mmx9mmx5mm and the rest were similar on the left foot. I don't have the MRI in front of me. I believe they can also be confirmed by ultrasound. Some doctors will surgically remove them but be warned. They have a HIGH regrowth rate and if they regrow they will come back bigger and faster (not meaning to scare you). My doctor has seen that all too often. He says he will not remove mine unless I get to the point that I want my foot amputated because when he does remove it he will have to remove my entire plantar fascia and I will be left with only nerves and bones! If you find out that you have this...PLEASE...do research on it and do not just let anyone try to remove it.
I also get massage weekly on my feet and although it is very sore, it seems to have slowed down the growth.
These tumors are benign!!! I can see them sticking out from under the skin sort of like a peanut that someone implanted on the left foot but I cannot see the ones on the right. I can just feel them. The left does not hurt, only the right hurts! Hoppy