Hi, thanks for posting your query.
You seem to have developed allergic contact dermatitis
. It can be due to anything you came in contact with, may be a plant, or any other thing else.
You seem to have been rubbing due to itching. Actually rubbing initiates a scratch itch cycle which increases the itching. So now you may take oral anti histamine
twice a day and avoid rubbing or touching the area.
You may apply calamine
lotion over the rash.
If it does not settle or increases and spreads in a day or two you may consult a dermatologist
for exact diagnosis and treatment.
Hope this helps you.
Wish you a speedy recovery.