I'm so worried. He had very bad red nappy rash around his bottom (the actual "hole") for a few days and then this morning I noticed a round-ish swelling/lump. Took him to hv who got doctor in and she's sarted him on antibiotics and said if it gets bigger/bursts or he gets a temp I have to take him to paed a&e. I'm so scared. Anyone ever heard of anything like this? How long do antibiotics take to kick in? It's causing considerable pain too. He is 6 months, btw.