Yes, we have big trouble with crypto. Can’t say we’ve had any calves lose their hair though. Be aware once you’ve got crypto you’ll have trouble for years to come. We have to Halocur every calf born now every year despite pressure washing and disinfecting the shed out. Ring worm is more round patches, but without seeing it would be difficult to say if it’s ring worm or not. If it is, there’s not much you can do unless you want to vaccinate/treat with the imported vaccine from the vets.