Did you notice the slit the same time you noticed the tufts of fur? Is the Slit in his ear bleeding or fresh looking?
If so they may have had a scuffle if he is bonded?
my buns had little slits in their ears, from over grooming the inside. i asked the vet what it was and they said it was fine and should clear up. just to keep an eye on it.
as for moulting, my once red carpet is now white after only hoovering it yesterday!