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As this is a bacterial infection it can be treated by the use of antibiotics. It is recommended that the chicken be taken to the vets for the foot to be examined where a course of antibiotics will be administered. Treatment should be obtained quickly as this infection can quickly cause further problems for the chicken with extreme swelling sometimes leading to surgery being the only treatment option.
The foot should be disinfected and this can be through an antibacterial animal spray or the use of a controlled iodine solution. Whilst the foot is healing the chicken should be kept in a controlled area with clean soft bedding to avoid further irritation on the foot. The infection usually clears up within 7 days, but it concerned you should return to your vet.
There are home remedies that some people claim to help relieve the infection without needing to have vet treatment. These include bathing the area and disinfecting as described above then applying an ointment of either Calendula cream or Comfrey cream to the area morning and evening to cleanse the infection and reduce the swelling allowing the area to naturally heal.
"Clean the foot completely with warm salty water and look for the puss spot. Lance it with a modellers knife or scalpel and squeeze out the puss if you are able or just tease out the head with the scalpel point or cotton buds.
Put some salt on it for a minute or 2 then rinse off, dry well and then apply Germolene antiseptic cream 2 times a day on a fabric plaster. Wrap the foot up as best you with more plaster strip (only where the affected by the bumblefoot) cleaning the wound each time you redress it as before. Make sure the bedding is clean where the bird is kept. You may make the infection go but the swollen bit often stays for longer."
Although some chicken keepers swear that home methods of treatment are effective, if you suspect the infection is worsening or not improving do seek advice from a vet so that the chicken is not suffering.
