My mare is itchy and I have been putting it down the large numbers of massive horse flies, the woods adjoining the fields, the stream and the muck heap all being nearby. But now she is rubbing bits of hair off, but also has patches of small bald bits, some are a bit scabby like she's rubbed it but others are in odd places like along her flank. Do they get lice in summer??! Both the ponies in the field have had lice this previous winter which was treated. The other pony is fine.