There once was a popular American TV game show called To Tell the Truth. It featured a panel of celebrities whose objective was to correctly identify an interesting contestant from 2 imposters. The imposters could lie, but the central character had to tell the truth. After questioning the contestants, the panel attempted to identify the central character.
In life, we commonly find ourselves in the same position as those celebrities on To Tell the Truth, trying to decide what is fact or fiction. Often the language of dermatology is used to describe the truth or falseness of what we hear.
Burgdorf WHC, Hoenig LJ. To Tell the Truth. JAMA Dermatol. 2015;151(3):315. doi:10.1001/jamadermatol.2014.4331