Add just enough water to some baking soda to form a paste. Apply the paste topically to the bite. Use a meat tenderizer, such as Spice Cargo, that contains the enzyme papain and mix with a few drops of water to make a paste. Applied topically, this mix may help control itching and swelling. Crush an aspirin and add a little water to create a paste. Aspirin applied topically may help with the pain. Follow package dosing instructions.

TL;DR in Vietnamese:
Thử dùng liệu pháp tại nhà để giảm đau và ngứa. Uống thuốc giảm đau không kê toa, chẳng hạn như aspirin hoặc acetaminophen.