Any idea what these sores are? [pic]

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Showjumper17

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Just noticed these on my mare. They're hard to see as they're right on the bottom of the lip, where it folds over. There is another on the other side of her mouth (similar place) but it is a lot smaller.
She lives out and has recently changed fields to one with much richer grass. It also has clover in it (heard that might be the cause.) it doesn't seem to bother her at all, and she'll let me touch it but just wondered what you thought?!
98xzxx.jpg
 
My girl gets little ulcers/sores on her lips throughout the summer and has done on several different pastures. The only thing I could think of was she was eating twigs or thistles
 
They are habronema lesions, caused by fly larvae attacking the soft mucosa around lips. Treatment is ivermectin wormer and fly control
Can also be found around nose or eyes.
 
My horse has just been treated for migrating bot fly larvae and his lumps where twice the size of this but after ruptering looked similar to this
 
My gelding has had some of these appear over the summer last year, treated him with ivermectin in case of botfly = no difference, the lumps kept appearing
plus we had seen no evidence at all of botfly, then we assumed he may be eating something he shouldn't and changed pasture, and he still got them, In the end we treated the ulcers
with salt water and squeezed and debrided the surface, this worked and he has had no trouble at all since, I am assuming it was a virus of some type.
 
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