Dr. Joe Griffin

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Cellulitis is just infection of skin.

Sepsis is if that infection goes to blood and produce chemicals affecting other organs.   

There are many potential causes for one foot being hot including infection, gout, fracture, charcot neuroarthropathy only to name a few.

You need to see a foot specialist for a thorough exam and proper treatment.   

There are many potential causes for this including multiple types of eczema, auto-immune skin disorders, contact allergy, viral infection, and fungus only to name a few.

You should see a dermatologist for a thorough exam.   

Yes, it is painful but some doctors will use a cold spray right before the injection to reduce the pain.