My friend's children have had strawberry marks & they are haematomas, where blood leaks through & the skin gets very raised & sometimes quite irritating. Most of them settle down, but some continue to get inflammed & can cause issues due to having blood leaking slowly into them. They get picked up at regular checks though so its nothing to be concerned about unless one shows to be more severe.

Matilda had a stork bite at the back of her neck and I think Jovie does too, but they only seem to show when the girls get hot & bothered LOL