My 9 year old son has a mark on his inner arm between bicep and forearm (opposite side of elbow). It looks similar to a hickey, but it is definitely different. It s darker and more solid than a hickey. He doesn t know where it came from and says this one itches. When he said, this one , I asked what he meant. He said he had one last week on his opposite upper arm, but that one did not itch.
Hi...what you quote is exactly fitting into the text book description of eczema which is a sort of skin allergy. You can use any over the counter antihistamines approved in your country and use dome topical emollients for a week. If this doesn't settle, approach your dermatologist. Regards -