Thanks for the query,
You have developed an allergic reaction
to the bite which has transformed into eczema.
As few days are already over, this condition is not dangerous.
Just keep Applying the mild steroid hydrocortisone
Also take an antihistamine tablet,
You are taking benadryl
so it is good enough.
This will give you some relief.
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.