Thanks for writing in.
Your podiatrist might be right about you having very bad feet, but it has to have a diagnosis. There are a thousand conditions that can affect your foot. So until we have a name for it, proper treatment cannot be started. Ask him if he has identified your condition, or if you need investigations like x-ray or MRI (Magnetic Resonant Imaging).
Now for whatsoever pain your doctor is giving you the depomedrol injection, it is imperative that you know its side effects. One of the known side effects is redness as you have. This alone is not evident for infection, at least not just yet. If redness is followed by swelling, local rise of temperature and severe pain on movement of foot, then one might say a possibility of localized infection. Till then, just consider this as a part of side effect or a low grade infection that your body immunity can take care of it.
However, I must caution you that repeated use of steroid injections in joints and other soft tissues is not advisable. It has pain relieving effects, no doubt but long term side effects should not be forgotten. Try doing some exercises rather, with help of a physiotherapist.
If you note any bad symptoms other than redness and pain, visit your physician immediately and start antibiotics. I would be available for follow up queries.
Hope that this information helps and hope that you will get better soon.
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Dr. Atul Wankhede