At the beginning of October I woke up one day and my leg was really sore near my knee. About a week or 2 later I didnt really have the pain anymore but my leg felt achy and tight (more in the back of my calf just below the bend in my knee). I had no other symptoms. I freaked out and went to the ER to be safe. They did an ultrasound and said there was no blood clot. It's now half way through Novemeber and I still feel sore in that same area. It doesn't hurt but the area feels tight and sometimes sore. I sometimes feel a bit sore or tight further down my calf. Theres also a very slight bulge in my upper calf which is very soft to the touch and it's not red or hot. Honestly it might just be my muscle. I still have no other symptoms other than the tightness. I've measured my leg to check for swelling (which there isn't). I have no idea what could have caused this. My mom and my boyfriend think I may have pulled a tendon in my leg.