1) In Sweden there’s an old pagan custom with big bonfires on April 30, called the Walpurgis Night.
Unfortunately, many hedgehogs have been hiding out in the stacks /piles of old trees and branches that will be lit during the night and many fatal accidents happen with hedgehogs.
Here’s a picture of a hedgehog that was badly burnt, but saved by a person from the fire. Wounds healed well, but new spikes didn’t grow up. The animal was released into a protected enclosure as it now didn’t have a complete defence from badgers and dogs.
2) Picture number 2, the balloon hedgehog. No reasons have been found for this condition but possibly damage to the respiratory system has allowed inspired air to escape and fill the subcutaneous cavity. Relief is provided by using a needle and syringe to release air and using antibiotics.
This is a quite common disease among hedgehogs. The animal in the picture was rehabilitated successfully and released.