DEAR DOCTOR K: I have an open sore on the bottom of my foot. Can I just cover it with a Band-Aid until it heals, or do I need to see a doctor?
DEAR READER: I am glad you asked this question, because in most circumstances, just covering it with a Band-Aid is a really bad idea. I'm guessing that this "sore" is more than some redness of the skin. I assume it is a little hole or crater, and that the top skin of the sole of your foot is gone. If that's the case, what you've got is called a foot ulcer. If you have a foot ulcer, you should see your doctor.