What Causes Random Itchy Spots And Red Bumps On The Skin?

My skin will become itchy in random spots, often my forearms, but it can be anywhere, and when i itch, i will often the get a red raised bump or several. The skin also becomes a little rashy sometimes like i scratched too hard. These marks do not disappear right away and stay until healed. My boyfriend also developed a rash around the same time, with the raised bumps and raised bumps. We have no idea what it could be. This has been going on for a few weeks now. It s never anything too serious, but it will not go away. No other symptoms.