The toxic skin, also known as infected skin or zombie skin, is the greatest rare skin that can be acquired by completing the zombie set or what the traders call "Z Set". It is considered an achievement for those who complete them by hardwork because such zombie parts are not easy to be obtained. In trade, the zombie parts, namely
3.zombie claws (which is the only rare hand item)
would be sold for 2 good rares or if you're lucky enough to find, 1 good rare. The appearance of the toxic skin is like a darker green skin with a toxic sign. For me, i refer to rich traders in the marketplace as the ones who wear toxic skin :D.
Note: it is NOT easy to complete z set if youre not cheater!