The color is a dull red/purple. Near the skinfold it's close to skin color (but still visible) while near its tip on the inner-thigh it's slightly more colored.
It's painless and isn't protruding out of my skin. Actually if I touch the area with my fingers I can't really feel any difference.
I'm 29 of average weight. (5'8, 165 pounds) and haven't changed weight in a long time. When I first saw it I though I migh've hurt myself somehow perhaps during sex without noticing. But it's still there, and it doesn't seem like it has improved or worsened over time, although I didn't pay much attention to it. I do sit at a computer all day, if that makes any difference.
I can't find any pictures of skin diseases that look even remotely like what I have. The closest pictures I found were stretch marks but it doesn't make sense for someone my size with a stable weight to get that in only 1 place. Or does it?