Immediately place a paste of Arm and Hammer’s® baking soda (NAHCO3) or other weak base such as household ammonia, smelling salts (diluted with water), or meat tenderizer, on sites of sting and ant bites. This helps to neutralize the formic acid injected by the stinging insect. The paste must be applied within 30 minutes to help.
A dose of Benadryl® may combat the swelling. This may be needed for 24 to 48 hours, as with yellow jacket stings the swelling is often worse on the second day. Local swelling at the site is expected; the degree of swelling varies in each individual.