Hello, As per my clinical experience, the boils on the feet with no response to antibiotics may be of concern with: - Underlying uncontrolled or undiagnosed diabetes mellitus - Drug resistance bacterial infection - Weak or low host immune response - Underlying peripheral aterial disorder - Recurrent skin infection through exposure to sand or else Remedy depends on the diagnosi, but general guidelines are: - Avoid walking barefoot - Wear loose, soft padded slippers - Avoid tight shoes - Local application of mupurocin ointment - Systemic antibiotics as per the culture report of swab taken from the boil over foot - Control of blood sugar - strictly avoid smoking if consuming Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Bhagyesh V. Patel, General Surgeon