Hi there

I have an intensely itchy area on the back of my left thigh. It is only on the left thigh, not the right, and is about halfway down, not near the genitals.
I have always had rough skin on my buttocks and the backs of my thighs, but the itching is fairly recent. The area where the itching is is covered it small red bumps.

It comes and goes. It seems like I will have a week or two of the itching and then it will go away for a bit (like a month or two) and then it will come back.

I shaved over it tonight in the shower and some of the bumps started to bleed.

Any ideas on what this may be?