These parasites are common in the chin's GI tract. It seems to be more of a problem for young animals than adults. There is more indepth information on Chinmom's site that will give you all a better understanding of this problem. The animal may appear to balloon up and their poop may be mucousy as well as sticky. It is best to seek a Vet's attention immediately .
Ringworm is a fungal infection.
There are several different forms of ringworm but the form that chins contact are body forms. This shows on the skin as a pink to red rash and causes the chin to lose fur. The infection can cause round patches with a clear like center to develop as well as red runny sores. It can be contacted by touch so when handling the infected chin you will want to wear gloves and be sure and disinfect the entire cage and area surrounding. You will want to see a Vet and have them do a KOH wet mount and look under the microscope.