The redness, swelling and hardness of the arm after the quadruple vaccination can be treated with physical therapy, and if the situation continues to worsen, then you need to consult a doctor in a timely manner. The redness, swelling and hardness of the arm after the quadruple vaccination is mainly considered to be caused by the adverse reaction of the vaccine. This kind of situation is generally mild, through physical therapy can be relieved, such as the use of hot towels for local hot compresses, promote blood circulation, etc., generally 2 ~ 3 days can be relieved. However, if there is persistent aggravation, or even fluctuating sensations, pus and other manifestations, the possibility of infection is greater. At this time, we need to consult a doctor in a timely manner, blood routine, local tissue culture and other tests, to clarify the type of infection, antibiotics for targeted treatment to avoid further development of infection, according to the doctor’s instructions to use medication can be.