A teenager who had a brush with "Britain's most dangerous plant" was left with an agonising blister the size of an orange.
Ross McPherson, 16, believes his skin grazed the loathed giant hogweed while on his bike in Dunbar, East Lothian, and within hours spotted a raw, red blister rearing its head.
The wild plant is deemed the bane of gardeners' and health and safety bosses' lives as its sap destroys the skin's natural barrier against the sun's UV rays, resulting in oozing blisters, pigmentation and scars.
