I had a patient who could not shave with a blade because of
a dermatology problem. With a spatula he applied some paste
with a hydrogen sulfide odor, barium sulfide,I think, and then after half an hour when the hairs had become almost goo, used same spatula to get the gunk off. It was a barbecide with a skull and crossbones label.

Here's a URL:
http://www.aocd.org/skin/dermatologic_diseases/pseudofolliculitis.html