Just want to remind everyone about the dangers of not wearing the correct the PPE when having to carryout essential maintenance on hedgerows whether at home or work. two weeks ago i had to strim a hedgerow that contained several species of umbelifers and low and behold two days later my arms were covered in blisters and now im just sporting loads of scars. Last week i had to strim another hedgerow containing no umbelifers but came out in a rash in both wrists that are itching like hell, not sure if plants are responsible or something else as each blister looks like it has a spot in the middle .By the way a day earlier i was in a lake removing potomagetom crispus by hand so could it have been from the lake.

Any help would be greatfull

Giant hogweed is well known for containing a substance that causes blistering, which is usually exacerbated by ultra violet, so it's possible that if only your wrists were open to the sunshine on the second job, the sunlight could have caused a reoccurence.

cheers wild cannon never thought of the toxin still been present on my skin afterwards.

Something similar happened to me. For a few months afterwards everytime my arms were exposed to sunlight they came out in a rash. Luckily it was only very mildly irritating.