Often when I come in from gardening I end up with blisters on my skin several days later. Do you know what could cause this?

The leaves from primulas, agapanthus or rhus trees have a tendency to give gardeners a bit of a rash but I would recommend calling the poisons phone line. If you give them a list of the plants you are gardening with, they will be able to tell you if any could be causing you ill effects. Remember it always pays to get these things checked by your local doctor.