If your arm is swollen after receiving the 13-valent pneumonia vaccine, you can apply localized warm compresses and other treatments, and if it worsens, you need to consult a doctor. If your arm is swollen after receiving the 13-valent pneumonia vaccine, it is generally considered to be an adverse reaction to the vaccine. Usually the degree is relatively mild, do not need special treatment, continuous observation can be, 3 ~ 5 days or so can subside, will not affect the normal efficacy of the vaccine. However, if the lump continues to expand, or is accompanied by pain, fluctuating sensation, pus flow, etc., then the possibility of infection is greater. In this case, it is necessary to consult a doctor in a timely manner for blood tests, local secretion culture and other tests to determine the specific type of infection, and then take antibiotic treatment. The use of specific drugs should be in accordance with the doctor’s instructions, not the use of prescription drugs.