I picked up a 5 gallon can of oil and proceeded to carry it to the upper level of the 6 A/C/ The area is hot and steamy. After I added oil to 6 A/C, I proceeded to come down. My safety glasses fogged, I missed a step causing me to fall bumping chin on piping. I did not have any other injury other than my chin."" Stri-Strips to chin.