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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 to decrease the swelling.
Do not use any moisturizer or oils till the time the lesion heals .
If the lesions continue to increase inspite of the above treatment, then you might have to see a dermatologist
as in severe cases, short term courses of oral antibiotics
or oral steroids
may be required.
Hope it helps
Wishing you speedy recovery
Dr Geetika Paul