A 12-year-old girl presented to the paediatric department at Singleton Hospital, UK, with an eight-day history of rash. The rash was located mainly on the exposed parts of the body, namely, her face, arm and shin. She had visited a bird sanctuary in sunny weather, the surrounding wetlands containing a wide range of vegetation. A day later, a rash appeared and was described as "red spots" and "bruiselike." More lesions continued to appear over the next three days. She was in good health and there was no past history of any skin problems. She was not on any medication. An initial diagnosis of non-accidental injury (NAI) or self-harm was made, which caused great distress and concern to the family. A second opinion was sought from a dermatologist.Investigations revealed normal full blood count, biochemistry and clotting profile.On examination, she had linear inflamed erythematous eruptions on her right forearm with some circular lesions ( Fig. 1). Similar lesions were present on the left shin. There was streaky macular hyperpigmentation on the right side of her chin (Fig. 2) and face. A diagnosis of phytophotodermatitis was made. Any further investigations for NAI were discontinued.
DiscussionPhytophotodermatitis is a phototoxic inflammatory reaction that occurs when the photosensitiser "psoralen," contained in the sap of plants, comes in contact with skin, followed by exposure to UVA light with wavelength in the range 320-380 nm. This gives rise to erythema, vesicle and blister formation, followed by hyperpigmentation. Hyperpigmentation can also occur without obvious dermatitis. The linear streaky appearance of lesions (inflamed or hyperpigmented) is key to diagnosis. This pattern results from brushing of the plant's stem and leaves with the skin. Phytophotodermatitis is a self-limiting condition. Regular use of UVAblocking sunscreens in the spring and summer may help diminish the cutaneous effects of phytophotodermatitis.The treatment of this condition includes removal of the offending agent and symptom control. Topical steroids of mild to potent strength can be used, depending on the degree of inflammation, site of the lesions and the age of the child, alongside analgesics.Four main plant families implicated as the causative agent are Umbelliferae (hogweed, cow parsley, wild parsnip, celery, wild carrots), Rutaceae (rue bergamont, citrus fruits), Moraceae (figs) and Leguminosae (scurf pea) [4].Phytophotodermatitis simulating child abuse [1-3] has been reported in children due to the garden herb rue [3] and to the inadvertent application of lime juice [2].The combination of linear inflammation, blisters or vesicles and hyperpigmentation occurring on exposed skin after playing in the parkland or wetland during the summer Eur J Pediatr (2007) 166:751-752