Bites by sea insects

This weekend past, went for swim Malagueata.

To my shock few days later came out in very itchy marks all over body.

I think had reaction to bites as laid me low for number days.

Has anybody come out in bites after swimming Malagueata and is this common?


I'm rather fit male from downunder ( or that is what I kid myself) and never had reaction like this to bites after swimming.


Any insight into this as rather nervous to swim Malagueata ever again.