All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
With regard to the marriage contract, if it took place fulfilling the conditions for the validity of a marriage contract, then it is a correct marriage; for more benefit on these conditions, please refer to Fatwa 83629.
As regards this disease, if it is a repulsive or contagious disease like leprosy, or is a disease that is dangerous and which may be transmitted to the spouse, or children, like AIDS and the like, then it is not permissible to conceal such diseases from the girl or her guardian. In this case, the other party has the right to invalidate the marriage if they did not know about it and they did not agree to it after they had come to know about it. Since divorce had already taken place, then the matter is finished and this woman deserves the rights of a divorced woman.
As regards the diseases that are not repulsive and which can be treated medically, then one may conceal them from the other party, but it is better to inform about it.