If a scab-like boil grew on most of it, [or] its pitam was removed, [or] it was peeled, [or] it was split, [or] it was punctured and is missing a slight portion, it is invalid.  If a boil covered a minority of it, [or] its stem was removed, [or] it was punctured and nothing was missing, it is valid.  An Ethiopian esrog is invalid.  If one is green as a leek, R’ Meir validates it, but R’ Yehudah invalidates it.