poping them will only work if you get it all out, no way to tell really if you have

best option go to the vet and get it scraped out have have him

if you want ot try it yourself you will need to clean the area very very well after it and use something like betadine to keep it clean.

id say go to a vet cause if you dont do it correct the first time it will come back and you will probly find more then