Also called Comedones. Other use: Morgan Bacterium (enterobacterium).Encyclopedia Entry for Blackheads :Blackheads. Blackheads can be treated with creams that contain salicylic acid or tretinoin. They can be removed by a skin doctor.Open comedones.Blackheads (comedones) Blackheads (comedones).Habif TP. Acne, rosacea, and related disorders.