I am a 62 y/o w/f. For past 2 weeks I have had an area on my left arm, between shoulder and elbow, the itches deep down Nader the skin. There is no change on the outside, no rash, no discolor. Scratching doesn't help be it is deep, not surface. What could have his be and what can I do to calm the itch. It is slightly warm to the touch. Thank you.