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Wasp bite at times leaves its sting and venom at the area of bit. It usually causes a local effect ,but if multiple bites take place then look out for sever allergic reaction
Firstly you require an oral antibiotic to prevent any secondary infection.Take any anti histaminic tablet orally to take care of the allergy
Most importantly you require a combination cream of topical steroid
and a antibiotic which should be used twice a day till you find improvement.
No specific anti-venom is available ,and treatment is only symptomatic .
It would be advisable if you can consult a skin specialist at your place for proper treatment.