What keeps biting me!

Whenever I go to the park or somewhere, especially in summer, I end up with this big, raised welts everywhere! The doctor said it's bites and just gave me a cream for the itching but most of the bites I've seen are just little pimples not big welts.

They usually have a little spot where whatever it was bit into me but this one doesn't seem to have one and this one is a lot smaller than they usually are. I've had ones that wrap around half of my arm and really affect the use of my wrist and elbows when they are so big. They get so hot and itchy 😔 I live in Ireland so there's no poisonous spiders or bugs here so it wouldn't be anything like that. I hate not being able to take my daughter to the park without being covered in bites the next day..