ible ". ▁In ▁addition , ▁medicine ▁can ▁be ▁admin ister ed ▁through ▁the ▁skin , ▁by ▁o int ments ▁or ▁by ▁means ▁of ▁ad hes ive ▁patch , ▁such ▁as ▁the ▁nic ot ine ▁patch ▁or ▁ion top hor esis . ▁The ▁skin ▁is ▁an ▁important ▁site ▁of ▁transport ▁in ▁many ▁other ▁organ isms . ▁ ▁Water ▁resistance : ▁The ▁skin ▁acts ▁as ▁a ▁water - res istant ▁bar rier ▁so ▁essential ▁nut ri ents ▁are ▁not ▁was hed ▁out ▁of ▁the ▁body . ▁ ▁Sk in ▁fl ora ▁ ▁The ▁human ▁skin ▁is ▁a ▁rich ▁environment ▁for ▁micro bes . ▁Ar ound ▁ 1 0 0 0 ▁species ▁of ▁b acter ia ▁from ▁ 1 9 ▁b acter ial ▁ph y la ▁have ▁been ▁found . ▁Most ▁come ▁from ▁only ▁four ▁ph y la : ▁Act in ob acter ia ▁( 5 1 . 8 % ), ▁F irm ic utes ▁( 2 4 . 4 % ), ▁Prote ob acter ia ▁( 1 6 . 5 % ), ▁and ▁B act ero id etes ▁( 6 . 3 %). ▁Prop ion ib acter ia ▁and ▁St ap hy loc oc ci ▁species ▁were ▁the ▁main ▁species ▁in ▁se b ace ous ▁areas . ▁There ▁are ▁three ▁main ▁e colog ical ▁areas : ▁mo ist , ▁dry ▁and ▁se b ace ous . ▁In ▁mo ist ▁places ▁on ▁the ▁body ▁C ory ne b acter ia ▁together ▁with ▁St ap hy loc oc ci ▁domin ate . ▁In ▁dry ▁areas , ▁there