Is it permissible, in Sharia, to perform a fat injection into the breast to correct a congenital deformity, and what is the ruling on increasing body and facial hair? Are these matters considered necessities that permit surgical intervention?

The fundamental principle regarding breast augmentation procedures is that they are forbidden, unless the deformity is unusual, in which case there is no harm in performing them to restore the breast to its natural size. However, there is no harm in enlargement through harmless medications and drugs.