Hi can anyone help me? i have been clearing grass in a friend's field in Abbotsford, and have now developed blisters on my arms after being out in the sun. i come from Britain and had this before after cutting Giant Hogweed. the sap from this plant reacts with sunlight and caused blister on the skin which can last for up to year. Every time the sun shines the blisters will reform. I did not think there was anything like that here. It has been three years since i had contact with Giant Hogweed so i do not think this skin reaction is due to old "plant" problmes but is obviously a new problem. The field is in the raspberry growing area of bc and has been cultivated in the past but the grass has not been cut for a while. It is not poisionous ivy because it happened in grass.