Whether only a bishop can confer this sacrament?

❌ Objection 1 : It seems that not only a bishop can confer this sacrament. For Gregory (Regist. iv), writing to Bishop Januarius, says: "We hear that some were scandalized because we forbade priests to anoint with chrism those who have been baptized. Yet in doing this we followed the ancient custom of our Church: but if this trouble some so very much we permit priests, where no bishop is to be had, to anoint the baptized on the forehead with chrism." But that which is essential to the sacraments should not be changed for the purpose of avoiding scandal. Therefore it seems that it is not essential to this sacrament that it be conferred by a bishop.

❌ Objection 2 : Further, the sacrament of Baptism seems to be more efficacious than the sacrament of Confirmation: since it bestows full remission of sins, both as to guilt and as to punishment, whereas this sacrament does not. But a simple priest, in virtue of his office, can give the sacrament of Baptism: and in a case of necessity anyone, even without orders, can baptize. Therefore it is not essential to this sacrament that it be conferred by a bishop.

❌ Objection 3 : Further, the top of the head, where according to medical men the reason is situated (i.e. the "particular reason," which is called the "cogitative faculty"), is more noble than the forehead, which is the site of the imagination. But a simple priest can anoint the baptized with chrism on the top of the head. Therefore much more can he anoint them with chrism on the forehead, which belongs to this sacrament.