I am concerned about a recent sexual partner. The last time I was with him, I noticed a large (maybe 2 in long and 1 in wide) bruise like thing on his thigh. There were no other noticeable similar patches. I guess that I am worried that it may have been Kaposi's Sarcoma, do they get this large? He thought it was a bruise, but it didn't seem to hurt him much. Would he have other KS on his body or is it possible to just have one?
That would be quite large for a typical KS lesion, but that doesn't mean that it isn't KS. It is possible to have only one lesion.