Localized redness after BCG vaccination is mostly normal. It may also be caused by allergic reactions and co-infections.
Generally speaking, the BCG vaccine can cause a corresponding reaction caused by the biological activity of BCG bacteria.
In most cases, redness and swelling appear locally at around 2 weeks, later becoming pus or forming ulcers, which crust over and form a scar after 8-12 weeks. A small number of people develop slight swelling of the axillary lymph nodes on the inoculated side 4-12 weeks after vaccination. Generally this kind of reaction does not need to be treated, local redness and swelling can not be hot compresses, pay attention to keep the local clean, to avoid secondary infection.
Some people may have localized allergic reactions after vaccination, local skin redness, rash with itching. This situation should pay attention to identify, if necessary, should go to the hospital.
Some patients may have a combination of bacterial skin infections. These patients may have fever, localized redness, swelling, heat and pain, and in some cases, pus breakout. Erythromycin ointment and mupirocin ointment can be applied locally under doctor’s supervision.
If there is any discomfort, it is recommended to go to the hospital in time to avoid delaying the condition.