Botanical Dermatology PHYTOPHOTODERMATITIS Phytophotodermatitis connotes phototoxic reactions consisting of erythema (with or without blistering) and delayed hyperpigmentation. Phototoxicity implies an immediate or delayed inflammatory reaction caused by the combination of a topical or oral photosensitizing agent followed by the appropriate wavelength of ultraviolet radiation (UVR) to the skin.37 This response can occur in any person who has been exposed to adequate amounts of a photosensitizing chemical and UVR.
This discussed the reaction between skin and the oils of any plant like parsnip