since you don't have severe pain/burning, you probably only need 100mg of thiamine a day.
In regards to your friend:
1) they probably took a tissue sample to culture to find out what organisms (germs) are present
2) The MRI is probably to evaluate the bones/ligaments and deep structures
to see if the ulcer goes beyond what can be seen.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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