I went on a short trip and when I came back there was a small rash on my left hand. I knew it was probably an allergy so I left it and thought it'd go away after a few days. Now however, its spread all over my arms and its begining to show on my back and neck. They're small red rashes and spots probably 5-20mm in diameter. They don't itch, but spread. I have no idea what it is. In some of the rashes, it appears the skin at the centre of the rash has dried and died out.
I thought it might be contact dermatitis, but its not itchy. And when i searched up other possible causes like rubella - i didn't have any of the symptoms. In fact i have no other symptoms except small rashes as i've described. I've had no headaches, no fever, no runny nose, no sore throat, no cough, no red eyes.