Treating bad fly bites?

My mare had some pretty bad fly bites when I bought he, all on her chest, face, and tummy. Well mst have cleared up, except for her tummy. It's almost like one long scab, no hair and it's raised. What can I do to get rid of them and grow her hair back?
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I'd like to know this too, my girl has some nice scars frrom flies >.<
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MTG or Corona ointment

Swat, applied liberally.