SUBCUTANEOUS

sub ‧ cu ‧ ta ‧ ne ‧ ous /ˌsʌbkjuːˈteɪniəs◂/ BrE AmE adjective technical

[ Date: 1600-1700 ; Language: Late Latin ; Origin: subcutaneus , from Latin sub- + cutis 'skin' ]

beneath your skin:

subcutaneous fat

—subcutaneously adverb