How do you get the swelling of a foot down from a bee sting

Make sure the person isn't allergic to bee stings first. Severe reactions may need epinephrine, for example with an Epi-Pen. Remove the stinger, wash the area with soap and water, place ice or cold compress over the affected area. It can take two or three days for the pain to dissipate or disappear. Also the pharmacy caries a Bite and Sting Relief swab or wipe. This product does help provide temporary pain relieve.

cold pack is best
if you start to have trouble breathing , call the ambulance immediately

Your body is responding to the bee venom by releasing histamine. This increase blood flow and causes the redness and also triggers the nerves for itching

This is a really old (almost) forgotten remedy for bee stings. It probably sounds impractical considering modern medical advances, but it works. Dip the heads of about a dozen wooden matches in a small amount of water to dissolve the tip to make a paste and apply this to the bee sting site.

Sweat bees do hurt...but, I do not swell up when I am bitten ( I have BAD allergic reactions to bees, wasps.. etc -- hospital trip bad!!), ...Yellow jackets nest in the ground.. they hurt and make me swell up and grant me a trip to the hospital ..especially if I get stung by more than one..(of anything)... this is probably what got you... did you run over them while mowing?.. this is a COMMON way to stir them up!! ...and they like to attack in swarms.

pictures of yellow jackets and hornets Google Search

The sting itself is fairly obvious and is now probably gone if you can't see it, but do take care to look around inside the mouth. So close to the mouth and throat is a concern though. If you are able to access one without undue expense, take the child to an emergency dept or doctor and watch carefully for any signs of swelling in the tongue, throat and airway.

Also ask about the possibility of sensitisation and allergic reaction to future stings. All the best with this.
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I have attacthed an article for you at the bottom included is the web link. http://www.webmd.com/allergies/guide/insect-stings

Bee stings can be very uncomfortable and painful and for some people who are allergic to them - very dangerous.

The first thing to do is to remove the sting as quickly as possible. You can use your fingers or tweezers. It doesn't matter how it's done.

People who know they are allergic to bee stings should carry an Epipen with them and if they should be given it straight away and not wait for symptoms of an allergy to appear.
If the person is having an anaphylactic reaction, emergency services should be called immediately as this can be life threatening.

Go to the ER, it sounds like a snake bite.