Thrombosed vein?

Patient : Hi there, I have had a slight problem with my penis. There is what feels like a thin hard string or thread running across the underside. It is about halfway down the penis and is about 4mm long and 0.5mm wide. It seems like it has moved very slightly in the last few days but I'm not sure. I went to the doctor last week and he did an examination on my penis and said it seemed normal but he didn't specifically mention what he thought it was that I was feeling. I am worried that he might not have felt it properly as it is quite small and is less pronounced (although still there) when my penis is flaccid. I have read on some forums about a thing called a Thrombosed Vein and think that this might be it although I couldn't find much information about it. The "thread" is not visible to look at except for if I stretch the skin over it slightly when erect. It isn't causing me any pain but I can feel it slightly sometimes. I would really appreciate some answers on this as I am quite worried. Thanks!
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