by the American Contact Dermatitis Society (ACDS).
Sulfites are currently not found in most screening patch test series, so may be missed as a relevant contact allergen, Donald V. Belsito, MD, emeritus professor in the Department of Dermatology at Columbia University, New York City, said in his presentation on the Allergen of the Year on March 7 at the annual meeting of the American Contact Dermatitis Society in San Diego. Sulfites, he noted, are distinct from sulfates, and the groups do not cross-react with each other.
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Sodium disulfite, an inorganic compound, belongs to a group of sulfiting agents, which contain the sulfite ion SO32− and include ammonium sulfite, potassium sulfite, and sodium sulfite, Dr. Belsito said. Sulfites function as antioxidants and preservatives in a range of products including food and beverages, personal care products, and pharmaceuticals.
The type of sulfite allergy diagnosed by patch testing is type IV hypersensitivity or delayed-type hypersensitivity, where patients present with pruritic, red, scaling macules, papulovesicles, and patches, Dr. Belsito told this news organization. “It is not the type I, immediate hypersensitivity that causes hives and, in some cases, anaphylaxis,” he said. Sulfites also can cause these side effects, so correct labeling of food and beverages is important, he noted.
Some common nonoccupational sulfite sources include hair coloring and bleach products, hairspray, tanning lotions, makeup, sunscreens, and deodorants, Dr. Belsito said in his presentation. Medications including topical antifungals, topical corticosteroids, and nasal solutions can be culprits, as can water in swimming pools, he noted.
In occupational settings, sulfites may be present not only in food and drink products but also can be used in production of products, such as those used for sterilization during beer and wine fermentation, Dr. Belsito said. Other potential occupational sources of sulfite exposure include healthcare settings and textile, chemical, rubber, and pharmaceutical manufacturing.
High-sulfite food products (> 100 ppm) to be aware of include dried fruit (raisins and prunes are exceptions), bottled lemon or lime juice (but not frozen products), wine, molasses, grape juice (white, or white, pink, and red sparkling), and pickled cocktail onions, Dr. Belsito said.
“Like other contact allergens, the clinical presentation correlates with exposure,” he added. A study by the North American Contact Dermatitis Group (NACDG) found that 28.8% of patients positive for sulfite allergy on patch testing presented with facial dermatitis, which was not only related to cosmetics and medications used on the face but also from products, such as shampoo, used on the scalp that dripped onto the face. “The scalp is relatively resistant to the expression of contact allergy and may not be involved at all,” he said.
According to the NACDG study, the hands were the second most common site of dermatitis associated with sulfites (20.5%) followed by generalized distribution (13.6%). These sites are to be expected, given the sources of food and beverage, personal care products, and occupational materials, Dr. Belsito said.
“Eczematous dermatitis of the lips is also common in patients with ingested food sources of sulfites,” he said.
Systemic contact dermatitis to sulfites has been documented following oral, rectal, and parental exposure, Dr. Belsito told this news organization. “Systemic dermatitis may present as a scattered/generalized dermatitis, symmetrical drug-related intertriginous and flexural exanthema (also referred to as baboon syndrome), or erythroderma,” he said.