HI, I Have Noticed Since Few Years That I Have

HI,

I have noticed since few years that I have a like a knot/globule thing on my lower back on the right side along my hip bone and I wonder if thats ok. I remember asking it lightly with physical therapists and massage therapists and they have said that they've seen on others. But still I wonder. Just wanted to find out if thats something not uncommon. Please let me know.