Is it true that a man is allowed to annul a marriage for the reason of leprosy and vitiligo in his wife, but the wife cannot do so if the husband has these ailments?
Bismihi ta'ala
If an Islamic marriage is conducted, and it is revealed to the new husband that the wife has certain hidden physical or mental defects or disability, the husband has the right to opt to annul the marriage.
Of course, some of these conditions would be related to the physical appearance of the wife's body, and as a man finds physical attraction to be of importance, if he is not satisfied with dealing or living with a certain condition, one of them being leprosy, then he has the option of nullifying the marriage.
This is his choice, whether to continue with the marriage, or to nullify it. That's why its always important for all parties to be upfront and direct and honest as possible when it comes to marriage proposals. This would avoid any future problems or breaking of a heart or putting oneself in such a difficult position.
With prayers for your success.