Sorry only now getting back you lads been in work,
Sandymere- thanks for the advice but from looking at the photos and information on the link I can't see it being that, it's only a singular boil like lump.
Air gun- could well be ring worm mate, haven't done her over the summer shall pick some up in the morning, thanks for your time
Richie- no there's no puss, she cut it open a few days ago going through cover, checked it then for puss, cheers anyway??