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Looks like you have developed a lesion of Vector dermatitis, also known as Paederus dermatitis
Paederus dermatitis is a peculiar, irritant contact dermatitis
characterized by a sudden onset of red lesions on exposed areas of the body.
The disease is provoked by an insect belonging to the genus Paederus.
You need to apply an antibiotic/steroid
combination cream over the lesion twice a day.
Take oral antihistamine like levocetrizine once a day to decrease the swelling .
Do not use any moisturizer till the time the lesion heals .
Hope it helps
Wishing you speedy recovery
Dr Geetika Paul