My son is 6 months and it’s only just healed. I kept asking the health visitor who said it’s fine but it kept weeping and bleeding then scabbing for months. I ended up taking him to the doctors and again she said it’s fine. Apparently, the worse/longer it takes to heal means they would have had a worse reaction if they caught TB than those that heal quickly! Not sure if it’s true but it will heal
It's mentioned in the flyer that they give after the vaccination for some kids it takes longer to heal compared to others, but still, if you are concerned, book a call with your GP