just heard about an insect repellant patch from some americans...means US-citisens...
they where totally happy with it. it stickf for three days even in the sea and thay said it does not have any harsh chemicals... the mosquitoes come closer, smell you and go! Not that you have a sent that humens can smell.... thse people smelled just fine.
don't know the name. but they said they just googled "insect repellant patch" and found it easily. just for the ones that get REALLY bitten.
otherwise (I get bitten too) it is just a matter of not scratching