Strange question:which chemicals cause skin reactions

[Dandush]

A little complicated and interesting story, I will get down to the point: I need a number of substances that cause skin rashes/skin redness or overall has a bad reaction to human skin. This is all for research purposes for natural skin products me and a group of friends are developing.

 

[Borek]

Google for skin irritants.

Topic locked. Please contact me by PM if you have ways of proving this is a legitimate request and not some dangerous prank.