Thanks for your query,I
Looks like you have developed a lesion of insect bite.
Such lesion are usually sudden in development .
These are red and can be associated with both itching and pain.
Oozing out of fluid is also common from these lesions.
You need to apply a topical steroid
antibiotic combination cream over the affected lesion.
You can go addition take oral antihistamines to relieve the associated discomfort.
Hope it helps.
Dr Geetika Paul