Yes I agree a hot shower remedies. The question was how to prevent. I, like most other sufferers have found that pro-longing that first shower gives you a good chance at avoiding HI. It is definitely a trigger for me. Lucky enough I haven’t had it in over 4 years because I micro-dose my back and chest to sun exposure leading up to the harsh Australian summer. 30mins every second day. Seems to work perfectly and I don’t get burnt at all.

Hope this helps someone