You may want to consider trying a foot bath for your insect bite.
Put 3.8 liters of water in a container that will also fit your foot.
In a glass put 5 ml (1 teaspoon) of 22.4% sodium chlorite (MMS) and add 2.5 ml (1/2 teaspoon) 50% citric acid . Let this activate for 10 minutes, then pour it into the water. Add 1/4 teaspoon baking soda, stir to mix, and soak your foot for 15 - 20 minutes.
It may take 2 - 3 of these to get the infection under control.