It is sometimes claimed that the multiple personalities of a person with dissociative identity disorder may not only display different character, behaviour, and movement types, but even show different functionings of the body. Quoting,

One example is a boy who endures allergic reactions when drinking orange juice including symptoms such as hives and water filled blisters which subside immediately when he switches to a different personality.

Another mention of (probably) the same case is here. So to be concrete:

Is this particular story correct?

In general:

Have there been verified cases of split personalities with significant differences in body function, such as a different immune system, different hormone levels or different physical strength?

While my first link provides some references to publications on this topic, I am uncertain as to whether they represent the scientific consensus, in particular in light of the controversy on split personalities mentioned at this related (and still unanswered) question.

This question was inspired by the movie Split, where this is a major theme.

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    If nobody on this site is able to answer if multiple personalities even exist, how would someone be able to answer the title question? – sumelic Jul 1 '17 at 0:45
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    A related question: Did a nocebo study find that rashes could swap hands? – sumelic Jul 1 '17 at 0:46
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    @sumelic: Mainly by providing a negative answer to this question without arguing against the existence of multiple personalities as such. But even a positive answer to this question may not presuppose a positive answer to the other one: different personalities may display different physical traits even if DID is merely therapy-induced. – Saibot Jul 1 '17 at 1:19
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    Closely related: skeptics.stackexchange.com/questions/6766/… – Oddthinking Jul 1 '17 at 5:13
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    @sumelic re. Multiple personalities: Do they exist? I think that question from 2011 is unanswered because it's too vaguely defined, it'd probably be closed if it was asked today. There's no doubt that dissociative disorders exist, or that some show what appear to be separate personalities and memories; the controversy is around what causes it and whether these people truly can't have awareness, control or access to memories, or whether there's an element of role play or social influence shaping the "personalities"... – user568458 Jul 2 '17 at 20:42

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