Ay normal lang yan, mama! Hindi lahat ng babies ang makakakuha ng visible scar or papula after BCG, it really depends on how their body reacts, and some kids just don't develop that mark even though the vaccine is working fine. One of my mum friends' baby didn't have any redness or scar din but ang pediatrician assured her na okay lang, the protection ay nandoon pa rin, so I'd say best to ask your baby's doc during the next checkup to make sure everything took well. Walang need mag-alala kung walang marks, hindi yan sign na hindi effective!