[Charles Martel]

...like a rogue rash, an STD, flaring up at unexpected times and in unexpected places and when it fades, you gently let yourself forget all about it until it suddenly erupts and hits hard and ruins your day, and then you can only sit back and moan softly, slather on ointment, shudder.

Enough about your personal life, Mark.

[Diogenesis]

The writer appears to be describing his own tertiary syphilis.

[DuncanWaring]

You noticed too, I see.

[mr_hammer]

“No, more like a rogue rash, an STD, flaring up at unexpected times and in unexpected places and when it fades, you gently let yourself forget all about it until it suddenly erupts and hits hard and ruins your day,”

Wouldn’t know Mark!