The following are the hazards of protein threads: 1, compared to ordinary silk threads, its tensile strength is relatively weak, if the wound tension is relatively large, especially in the joint position, it may be easy to cause the protein threads to break during the activity, thus reopening the wound. 2, allergic reactions, if the protein or other substances in the protein threads are allergic to the situation, after the treatment of the wound protein threads and skin 3, there will be a reaction to the thread, the body and the protein thread in the chemical reaction, the absorption process may be rejection, resulting in local redness, swelling, heat, pain, serious infection, pus and other situations.