A blade assembly (330", 330) comprising: a blade holder and a nose portion only at one end of the blade holder, the blade holder having an upper shelf surface extending in a rearward direction away from the nose portion, the blade holder having a first blade holder side and a second blade holder side; a single blade carried by the blade holder and disposed at a lower portion of the blade holder, the blade extending along a centerline of the blade holder and in the rearward direction away from the nose portion, the blade located between the first blade holder side and the second blade holder side, the blade having a cutting edge, a first blade side and a second blade side, the first and second blade sides being disposed adjacent the cutting edge; a safety cage fixed over the first and second blade sides, the safety cage constructed and arranged to limit the amount of penetration of the blade into facial skin; a pair of parallel aligned slots including a first slot and a second slot, the first slot disposed along a length of the first blade holder side and below the upper shelf surface, the second slot disposed along a length of the second blade holder side, each slot constructed and arranged to slidingly receive a complementary rail of a hand-held dermaplaning device for mounting the blade assembly thereto; and one or more first notches located on the first blade holder side and one or more second notches located on the second blade holder side, each of the first and second notches configured to cooperate with a blade retainer to hold the blade holder in position on the blade retainer for slidably attaching the blade assembly (330") to the hand-held dermaplaning device when the blade assembly is held by the blade retainer. a blade holder and a nose portion only at one end of the blade holder, the blade holder having an upper shelf surface extending in a rearward direction away from the nose portion, the blade holder having a first blade holder side and a second blade holder side; a single blade carried by the blade holder and disposed at a lower portion of the blade holder, the blade extending along a centerline of the blade holder and in the rearward direction away from the nose portion, the blade located between the first blade holder side and the second blade holder side, the blade having a cutting edge, a first blade side and a second blade side, the first and second blade sides being disposed adjacent the cutting edge; a safety cage fixed over the first and second blade sides, the safety cage constructed and arranged to limit the amount of penetration of the blade into facial skin; a pair of parallel aligned slots including a first slot and a second slot, the first slot disposed along a length of the first blade holder side and below the upper shelf surface, the second slot disposed along a length of the second blade holder side, each slot constructed and arranged to slidingly receive a complementary rail of a hand-held dermaplaning device for mounting the blade assembly thereto; and one or more first notches located on the first blade holder side and one or more second notches located on the second blade holder side, each of the first and second notches configured to cooperate with a blade retainer to hold the blade holder in position on the blade retainer for slidably attaching the blade assembly (330") to the hand-held dermaplaning device when the blade assembly is held by the blade retainer. <EOS>