my lower back is disproportionate. i noticed it today at work. the left side is larger, and also has a noticeable striation in it, while the right is smaller and smooth. i was scared, so i asked my gf to check my back. w/o me saying anything she told me the left side was larger. anyways this is disturbing to me, because i'd imagine of all muscles, your lower back needs to be straight so you can support your torso w/o hurting your spine. the only thing i can think of is that i did ME legs today, and did real heavy (for me) good mornings. maybe it's swollen?