Blotchy Skin

I was reading the messages about red, blotchy skin, and the exact same thing happens to me too! If I get nervous, or in the sun, or just about anything my skin gets blotchy. Recently I had to do a presentation in front of my class, so I wore a turtleneck to prevent people from seeing my neck, and so my cheeks turned bright red instead. Also I was talking to a guy and I was nervous and so I could feel my cheeks flaming. I reall hate how it does that, and I would just like it if someone knew of any lotions or anything that would help stop this blotchy annoyance! Thanx!