Hello,
Thanks for the query.
You might have developed an
allergic contact dermatitis.
Itch just in one arm followed by scabbing indicates aleergy.
you can apply a mild
steroid cream and take anti
histamine tablet.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
http://www.healthcaremagic.com/doctors/dr-rahul-kumar/64818
Wishing you a good health.
Thank you