Does your skin get marked when scratched? I scratched the skin of my arm, that was itchy, and got these red marks.
I've got that, I think it's called dermographia (literally translates to "skin writing")
Yes right now i have great big splotchy (half arm) red marks where ive bled under skin.
The red marks are caused by your scratching. They should go away pretty quickly. If they donβt it may be an allergic reaction to something, especially if it blisters. Goood luck. Stay well.