Redness of the wound after removing stitches of back acne may be caused by slight reaction to the stitches, pulling when removing stitches and other factors; it may also be caused by pus and bleeding of the wound. 1. Redness of wound after suture removal: on the one hand, it may be normal newborn tissue, which usually disappears with the gradual repair of scar tissue; on the other hand, if the body is allergic, there may be slight inflammatory reaction to suture knots, etc., which is usually eliminated by itself after suture removal without any worry. 2. In addition, due to the back, limbs and other places due to the skin tension is large, when removing the thread need to force to pull the knot, may cause local stimulation may also cause redness of the wound. 3. If the wound is not only red, but also has pus, bleeding, etc., it suggests that there may be an infection, and it is necessary to carry out local debridement and disinfection and re-dressing. The redness of the wound after removing the stitches of the back acne, need to actively consult the doctor, after clarifying the cause of the disease, to carry out targeted treatment.