I've just discovered a lump on the left side of my back, around the ribcage area. It is about the size of a 50p, quite round and smooth, I'd say v firm to touch, like you can't squash it, but I think you can move it slightly. Does it sounds Ike a lipoma or cyst, or are they soft? Please be honest. I don't want to waste a doctors time but also don't want to ignore it if it might be serious. Thanks for any thoughts.