Hi all, on DC3 so you'd hope I'd have a better idea of what I am doing, but it turns out I still have a lot to learn 
DS is nearly 6 months. EBF up until about 2 weeks ago when I have started to wean him on to formula in the evening. Built up from 20mls as I am prone to blocked ducts. I noticed a couple of times the skin around his mouth went a little red but it had disappeared in under 30 mins.
This weekend I tried some aptimil porridge. He couldn't have cared less about it, looked like I was trying to poison him. Skin around his mouth went really quite red for an hour or so. No other symptoms. His nappies are always 'loose' looking as BF. He's had mild eczema since birth. Mainly behind his knees and in his ankle creases.
Any thoughts? I was at the GP today anyway who was pretty dismissive of it all.