Can masturbation be allowed in case of a medical condition that requires it?

If someone has some sort of medical issue that requires masturbation (And I don’t mean IVF, or anything of that sort) would they be able to masturbate for that purpose? I have never heard of any case where this would be necessary, but if it in fact was, would it be a mortal/venial sin for that person to do so? Also, if it was necessary for a fertility test would it be alright to do so?

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