its not normal but it can happen. it means nagkaroon ng infection ung injection site.
sa 2 kids ko, ilang beses na silang tinurukan pero hindi nagkaroon ng infection.
you may consult pedia for proper cleaning and baka mabigyan ng ointment.
you may try langgasin using warm salted water after taking a bath ni baby.
kung ako, i will go to the pedia due to its redness.