1/3. Facial dermatitis, contact urticaria, rhinoconjunctivitis, and asthma induced by potato.BACKGROUND: Potato contains multiple heat-labile proteins which can induce immediate hypersensitivity reactions. Rhino-conjunctivitis, asthma, contact urticaria and protein contact dermatitis have been described in association with potato exposure. OBJECTIVE: A patient with possible airborne facial dermatitis to potato is described. RESULTS: A middle-aged atopic housewife with pre-existent atopic dermatitis suffered from rhino-conjunctivitis, asthma, and contact urticaria when pealing raw potatoes, but her main complaint was intense, treatment-resistant dermatitis of the face. The investigations showed a positive prick test, a positive patch test, and positive specific serum IgE to raw potato. Potato avoidance led not only to the resolution of the immediate symptoms, but also of the facial dermatitis, suggesting she had dermatitis due to this vegetable. CONCLUSIONS: Potato may induce contact dermatitis with positive immediate and delayed hypersensitivity tests.- - - - - - - - - - ranking = 1keywords = potato (Clic here for more details about this article) |
2/3. Allergic contact urticaria from raw potato.A 19-year-old man exhibited symptoms of immediate urticaria and angioedema related to contact with raw potato. A prick-by-prick test with potato pulp and rub test were positive. Specific IgE to potato was positive (class 2).- - - - - - - - - - ranking = 0.875keywords = potato (Clic here for more details about this article) |
3/3. Occupational protein contact dermatitis with type I allergy to different kinds of meat and vegetables.OBJECTIVE: Even though occupational protein contact dermatitis is not an uncommon finding in occupational dermatology, reports about multiple sensitizations are rare. High-molecular-weight substances such as proteins can pass the epidermis only if it is damaged and cause a sensitization. In a high percentage of case, atopic dermatitis might be the cause of this damage but cannot be regarded as the only cause. An interesting case is presented that was carefully worked up. methods: Scratch, intracutaneous, and prick or prick-to-prick tests with native occupational allergens were performed as single tests. The patient was patch-tested with the European Standard Series. The determination of allergen-specific IgE was performed by ImmunoCAP. The results were subdivided into six classes. In addition, oral provocations with relevant allergens were performed. RESULTS: The skin tests showed positive type I allergies to beef, lamb, horse, and pork meat, to pork and horse blood as well as to rye and wheat flour, raw potato, and pasta. Weak positive reactions could be found for fowl, duck, goose, and turkey in intracutaneous testing. The ImmunoCAP showed elevated specific IgE values for pork meat, raw potato, and rye and wheat flour. The oral provocation did not show any systemic or skin change. CONCLUSIONS: This case report demonstrates how an initial case of contact urticaria turns into protein contact dermatitis. It shows that the diagnosis can be made by means of scratch or prick tests with native occupational allergens. The determination of allergen-specific IgE by ImmunoCAP might be helpful, but a negative result does not exclude protein contact dermatitis.- - - - - - - - - - ranking = 0.25keywords = potato (Clic here for more details about this article) |