The Mufti Ash-Shaykh Abdul-Azeez AaliShaykh hafidaho-Allah was asked the following question:

Question:

If a girl undergoes an abdominal surgery, for example, after birth or a few months later; should her family inform her suitor of this surgery which left a scar up till now? Does he have a Shar`y (Islamic legal) right to know something like this or not?

Answer:

All praise be to Allah, the Lord of the worlds, and peace and blessings be upon our Prophet Muhammad, his family, his Companions, and those who follow his guidance until the Day of Resurrection. To proceed:

Muslims should be truthful in all matters, as trustfulness leads to every good and saves from all evil. If a suitor proposes to a young woman who has scars due to surgical procedures, her family should inform him, as some people may not accept or tolerate such marks. Furthermore, this may lead to serious problems between them and he may accuse her of having defects. The family of the bride should inform the suitor about her case to be clear from the beginning and not to expose themselves to blame later on.

[Reference]