The word "scrotal" refers to something that is related to or associated with the scrotum. The scrotum is the external pouch or sac that contains the testicles in male mammals. Full definition
As for scrotal sacs, Dear Author, that is an awesome rejection. (writerunboxed.com)
Sippell concluded: «A prolonged increase in scrotal temperature in early childhood may have an important role in subsequent testicular health and function, with implications for male fertility.» (nickisdiapers.com)
Some cats develop a swollen or slightly bruised scrotal area following neuter surgery. (riverbarkvet.com)