Real World article
(written from a Production point of view)

Andorian herpes was an Andorian ailment which, behind-the-scenes, James T. Kirk was once said to suffer from.

While filming Star Trek Beyond, McCoy actor Karl Urban ad libbed a line in which he, as McCoy, said he had noticed that Kirk's Andorian herpes had returned, and advised Kirk to "pop by the med bay." ("Gag Reel", Star Trek Beyond Blu-ray special features)

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