Hi, I have 2 guinea pigs, both males, and they have a pretty big cage. So, today, I was hanging out with them, and I noticed this huge thing on my guinea pigs nail, and I had no idea what it was. I picked him up and looked at it, It seemed as if it was his actual nail. it didn't look normal or right though, it is quite big. Does anyone know what this is, why he has it, and what to do?