Skin irritated

Hey ladies I noticed yesterday I started to get these red welps and bumps on my arm n leg but they would just appear out no wear so I thought I might be having allergic reaction to something or it could be contact dermatitis. It’s irritating my skin so bad idk what it is like I touch itch my arm or something n it’s nothing there but then I start to see red bump it itches . I ruled out bed bugs and mosquitoes bites . I do got a telephone video visit today with the doctor .