There comes a time in every family's life when they need an anti-itch bath. Sometimes it is allergies or excema, other times chicken-pox or rashes. This is ours.
All measurements are in the time-honoured non-standard measurements of "handful" "smidge" "a bit" etc.
Place a handful of rolled oats in a face cloth (I'm going to try adding lavender tonight too, 'cause I can)
Fasten with an elastic band
Put a handful of bi-carb soda in a warm bath and a smidge (possibly half a teaspoon?) of coconut oil
Swish it all around then add the itchy child
Use the face cloth with the oats in it to scrub at the itchy bits gently