What Causes Constant Itching All Over Body Followed By Pain In Arms?

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Hi for the past 5 days i have had constant all over itching , which wakes me up during the night and turns bright red and hot to touch when i scratch ... a few days after the itching started i noticed a dull all over aching pain in both my arms , which goes all the way down to my fingers ..... could the 2 be related in any way ?