Since 1926, a number of sources have reported the occurrence of dermatitis in workers who cultivate or process celery. The dermatitis had been attributed to an allergic reaction to the volatile oil. 16
Some celery workers, primarily Caucasians, develop phototoxic bullous lesions. Workers in greenhouses are less susceptible to lesions than those who work outside. Once healed, the lesions often leave areas of depigmentation or hyperpigmentation. Significantly, the bullae develop only after contact with celery affected by “pink-rot” a condition caused by the fungus Sclerotinia sclerotiorum . Skin reactions probably result from exposure to a furocoumarin followed by exposure to sunlight (UVA light). The pink-rot apparently increases the availability of the furocoumarin. Use of a sunscreen can prevent this reaction. 17 Furocoumarins may be carcinogenic, and their concentration increases 100–fold in celery that is injured or diseased. 18 Large doses of the oil may induce CNS depression, although the specific toxic syndrome has not been well characterized.
http://www.drugs.com/npp/celery.htmlWell I guess I won't be drinking this my skin is in bad enough shape with my psoriasis lolololol