Hamstring lump

I have a lump in my hamstring, its about the size of a golfball, however, not ROUND like that. If you cut a golfball in half thats about
as high as it sits off my leg. more long on the inside part of my hamstring tendon area.

It is not sore, has never been a bruise, and can only be felt when I flex my leg. If it were a mass, I'm sure i'd feel it when not
flexing, and it seems the harder I flex, the harder the bump gets... like its a muscle? It's only on my right leg, not left. It's
pretty noticeable tho.

I went for an ultrasound, they said there is no mass there that can be seen in an ultrasound.

Any ideas?

I have another appointment for a specialist in September. I read an article on irregular muscle growth.. Seems like its a possibility.

Like I said over on CJM chances are it's asymmetry and you'll always have a weird look to the one side. You could have had a slight tear years ago and not known what it was (could have felt like a really bad cramp) and it's only now showing up due to your increased muscle gain in the hamstring area making it apparent. All of us have these issues with certain body-parts not looking the same as the other side....IE Arnolds biceps are a great example as one is highly peaked and the other isn't. As long as there's no pain or bruising then I think you'll be fine....other than looking like some weird side show freak, but hey maybe with the right promotional work you could some money...

I like money.. good point :)

Thank you