It can be real confusing. I have seen scent glands that look as big as hemi's and seen hemi's that look like scent glands. Scent gland on average tend to be toward the outside edges of the vent (when popped) and flesh colored little knobs. Some are huge some are small. Real important to know what you looking at. I don't have experiance to tell 100% of the time so if I have any questions I get the vet to check by probing and if they get the same as me popping then cool and if not then I pop it there infornt of the vet to see if I get a different result.