What is not permissible to shave and what is permissible to shave? (Please detail the size of these areas)
It is not permissible to shave the chin and the area of the jawline (and adjacent to it), and shaving the sideburns is not permissible based on obligatory precaution (ihtiyat wujubi). However, shaving just the area overlying the cheekbones is permissible.