Cosmetic surgery is not problematic as long as it doesn’t cause harm to the body.
Grand Ayatollah Khamenei’s Response
Cosmetic surgery, per se, is permissible as long as it doesn’t require a non-mahram making skin contact with one (the patient) or require any other category of sin.
Grand Ayatollah Makarim’s Response
It isn’t problematic at all as long as it doesn’t involve or is not associated with any haram act; assuming a haram act is involved (e.g. a non-mahram sighting one’s genitalia or making skin contact with one), cosmetic surgery will only be permitted on occasions of necessity.
Grand Ayatollah Bahjat’s Response
Obligatory precaution requires one to abandon taking such an action.