I have not investigated this phenomenon within the internal worlds. All I know of the topic was expressed in the following words:

The karma of liars is monstrosity: children who are born with two heads, deformed children, are like that because they have been connected in the wrong way with the superior centers of the Being. These souls were intentionally and continuously lying in their past life. Therefore, they come into their new existence with a deformed body. Behold here what a lie is. —Samael Aun Weor