Thank you for posting your medical query to DoctorSpring.com
YES, your foot requires immediate medical attention by an ER physician in person.
Mainly because you are uncertain of which insect bit you, the severity cannot be determined or how to manage the situation.
How many hours ago were you bitten?
Have you noticed any other symptoms? Any pain? How fast is the swelling increasing? Any discoloration of your foot? Any discharge from the site where the insect bit you?
You also may need to get a tetanus shot depending on when your last tetanus shot was.
The topical itch will do nothing for you unless we first establish that the insect that bite you was harmless.
Kindly seek medical attention immediately,
Patient replied :
There are no poisonous insects in Rio whatsoever. It is easy to bring down the swelling with ice. There is no pain, just redness and swelling.
I cannot imagine why I would need a tetanus shot. I am very allergic to drugs like penicillen, so I am not keen on going to a doctor. I would prefer treating this myself.