Hi doctor My son developed a rash as shown in the picture suddenly on his right fore arm. It's not hard. There is no burning feeling when touched. Only when pressed in the middle, he feels a bit pain. The sensation is intact all over the rash portion and no itchy or burning sensation. He doesn't remember how he got it but noticed it on last sunday evening and showed us on Monday. We applied turmeric paste as a home remedy in the night before sleep. There is no improvement. Can you help understand the issue and how we can resolve it.