When I go tanning, I get a pin pricking sensation on the surface of my skin that lasts the next several hours. It feels like I m being pricked over and over, and the skin itches. Any ideas what is causing it or what I can do to stop it? I take no medication, I use no lotions. I just lay in the bed, and usually within two minutes I start to feel the pricks, and they grow with intensity the longer I stay in the bed.