Rash

Could be a sensitivity/ allergy to something or maybe dry skin/eczema? One of my nieces had a sensitivity to detergent (even baby detergent) when she was an infant. The rash looked similar so that may be something to ask your doctor. My sister ended up having to learn how to make her own all natural detergent and slowly transition to baby detergent over time bc my nieces skin was so sensitive.

thank you, I found it’s behind his legs so I have a feeling it’s eczema but I’ll be getting him checked x

That looks like eczema. My little one had it bad , then I figured out she is dairy intolerant so I had to stop eating cheese as I was breastfeeding and had to buy vegan formula from Germany. Which is flipping expensive but at least she has her milk and no eczema