I am really sorry to hear about your mum,and ofcoarse your father. I assume that this sawdust caused an allergic reaction of sorts,and your father has been seeing a dermatologist?

There are forums for dermatological disorders on the net, have you been able to find them? I will try to find a couple for you and post again.

Also the swelling in dad's legs,is that from the prostate cancer?

In relation to the pain, It sounds as if it would be appropriate for your dad to see a pain specialist. Someone his age, with prostate cancer and this condition as well should not have to stay up all night due to pain. Can his doctor refer him to a pain specialist?

I would alsolike to say that even though your in another state, it's really good to offer him support,even if it's over the phone. My grandmother lives far away,and now she is immobilised herself. When I speak to her I try to offer support and chear her up. I think it's important for people to know that they are loved and wanted. Your doing a good thing.