Dermatology Questions? Ask an Online Dermatologist.
Hi Dr. Ashori here.
Which side is the itchiness on?
The reason I ask is that if it's in the dominant arm then it's likely from a pinched nerve, something we call meralgia paresthetica.
If it's on the arm that's facing the car window it could be due to excess UV.
since it's only on one arm I would suspect more a nerve issue than anything else.
Though itching can be a sign of liver or kidney disease it would involve the entire body and not just one body part.
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