Oops sorry hun , they are so hard to tell apart (couldn't see any curly whiskers). Got my Boar as a Rex, wasn't till i bred him with a Rex Sow i realised he was a Teddy . Hence why i have the 3/4 Rex 1/4 Teddy Sows as i then put their Mum back to a pure Rex. I must admit i love the Rex, it's all i have ever kept & bred, Cavy wise (apart from my Puzzle the Teddy).
hey this happened with both my sisters guinnies and got so bad it ened up round one of their eyes. it was prodominantly on one of the guinnie pigs. we changed the hay for straw and nothing happened so we then changed the straw for shredded paper as bedding and that seemed to work we then found something else to use as their bedding *the testure resembles a course tissue paper* since then and after several hot water and fairy liquid baths to the bottom of the cage, not the pigs, the problem has been resolved. as for the pigs we tried mite cream and that didnt work so daily amounts of sudocream were applied and the pigs healed in no time. hope this helps.
trouble is a lot of petshop hay thats prebagged is in plastic bags so the hay sweats and goes manky before you buy it, thats why a lot of pigs pick up fungal infections,
and unless you know what it looks like, its hard to tell the difference between fungal and mites.
a good bath and scrub every few months is great for piggies skin