Different parts of the body vary in their ability to absorb pesticides. Scalp 32% -Forehead 36% Ear Canal 40% Armpit 64% Forearm 9% Abdomen 18% Palm 12% Back of Hand 21% Genital Area 100% Percent Dose Absorbed Ball of Foot 13% Chemical -parathion Maibach 1974Different parts of the body vary in their ability to absorb pesticides. Forehead 36% Back of Hand 21% Scalp 32% Forearm 9% Ear Canal 40% Palm 12% Ball of Foot 13% Abdomen 18% Genital Area 100% Percent Dose Absorbed Chemical -parathion Maibach 1974 Armpit 64%