Baby skin redness and swelling after vaccination, can do the following treatment: a. Do not need to deal with: If the redness or hard knot diameter <1.5cm, as long as the redness is not allowed to get wet, squeezed, especially to look after the baby, forbidden to let the baby scratch the redness with hands, after a few days will naturally subside. Second, hot compress treatment: If the redness or hard nodules in the diameter of 1.5-3cm local reaction, you can use a clean towel for hot compress treatment, several times a day, each time about 10-15 minutes. Third, hospital consultation: If the diameter of redness or hard nodules is >3cm, parents should promptly take the baby to the hospital for consultation. Parents are reminded that if the local redness, swelling, infiltration, followed by pus and formation of small ulcers appear after BCG vaccination, most of them will be crusted after 8-12 weeks, which is a normal reaction after vaccination and generally does not need to be treated. However, attention should be paid to local cleanliness, and neither cold nor hot compresses should be applied.