This is an infection caused by an etiologic agent called Human Papilloma Virus (HPV), funny enough it is sexually transmitted.

As you are looking at it, and it's disturbing to behold, a human like you that is prone to be infected is handling this deadly virus, day and night, working on the pathogenesis of this Virus to contain the spread, not minding if he or she gets infected or not. And these sets of people are not immortal or superhuman they have blood running through their veins like every other human, yet they chose this part to save other people, not minding if they Will lose theirs in the process.

Many of these devoted human breeds have died on this part, yet the rest will still not give up. These testers are called Microbiologists.