Inner calf pain?

I don't know the name of the muscle, but it's on the inside of the calf and it kills after I run. I stretch properly for about 15mins pre-run so I don't know what's going on. Is there any special stretch I can do to reverse the pain? It makes it hurt to even walk afterwards.
 
How painful is it? Possibly get it looked at, otherwise I would suggest resting it for a couple of days to a week.
Just for your information. You don't actually need to stretch before running.
 
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