Note the distinction between the entire skin of the body, of which there is only 1 in an organism, and zones of skin, of which there can be many. Examples: skin of knee

Any portion of the organ that covers that body and consists of a layer of epidermis and a layer of dermis.

http://upload.wikimedia.org/wikipedia/commons/6/6d/Skin.svg, http://upload.wikimedia.org/wikipedia/commons/e/e8/HumanSkinDiagram.jpg

we assume that mouse, HOG and GAID all mean zone of skin when they say skin. We also choose skin as an exact synonym, as it is more intuitive

portion of skin, skin zone, region of skin, skin region, skin

uberon

(...) it is well-established that neural crest cells contribute to both the dermal skeleton (craniofacial bone, teeth, and the caudal fin rays of teleosts) and the integument, including craniofacial dermis and all pigment cells outside the retina (...).[well established][VHOG]

UBERON:0000014

http://purl.obolibrary.org/obo/uberon.owl, http://purl.obolibrary.org/obo/cl.owl

• external soft tissue zone

• skin of body