Is it permissible for a person who has recovered from leprosy, but still has minor residual effects (some muscle atrophy and a shortened little finger), to marry? And is it considered trustworthiness to inform the prospective wife's family about this? What are the appropriate recommendations for him?

If you have recovered from an illness and doctors have stated that it is not contagious and does not prevent enjoyment, then you are not required to inform your prospective wife, and marriage is permissible. However, if the illness is contagious or prevents the wife's enjoyment, then you must inform her, based on the Hadith (definition): "There should be no harm nor reciprocating harm" and "He who deceives us is not one of us." It is recommended to supplicate abundantly, and for assistance, charitable organizations can be contacted.