What would cause blisters 30 minutes after death?

Blisters that appear shortly after death are typically caused by the process of decomposition and the accumulation of gases within the body. As tissues break down, gases can form, leading to swelling and blistering of the skin. Additionally, factors such as temperature and humidity can accelerate this process, causing blisters to develop more rapidly after death. This phenomenon is part of the natural post-mortem changes that occur in the body.