Contact of the skin to the oil from the leaves causes the blisters and rash. The fluid from the blisters is not contagious and will not spread. If washed with soap within 60 minutes of known contact to the plant, the reaction may be avoided. Keep clean, obtain Domeboro Tablets at the pharmacy to prepare a compress for drying up blisters. Remember the oil from the plants may be contacted from smoke when the plants are burning or from touching another’s clothes that has been in contact or petting a dog which has run through the poison plants.