Occupational contact dermatitis due to coffee

Airborne allergic contact dermatitis caused by coffee beans in a coffee roaster

“…Allergens have not yet been identified. In past cases, 2‐5 dermatitis was mainly limited to the site of direct contact whereas, in our case, dermatitis additionally occurred on areas such as the face, neck, and postauricular folds, which did not have direct contact with the coffee products. The patient lacked eruption only on the skin covered by her uniform.…”

“…According to several coffee‐related contact dermatitis reports, green coffee beans 2,3 or roasted coffee powder 4,5 were considered to be the possible cause. Allergens have not yet been identified.…”

Nail‐fold contact dermatitis from coffee powder

“…Patch tests were positive to coffee extract. Her dermatitis improved after she stopped preparing coffee (3).…”

Contact allergy to green coffee bean dust in a coffee processing plant worker

“…Contact dermatitis from green coffee bean dust has been reported less frequently, though 1 patient had both Type I and Type IV hypersensitivity (3). There has also been 1 report of a patient with contact dermatitis from serving coffee (5). Another allergen that coffee workers can be exposed to is castor bean, which has been a potent sensitizer as a contaminant (4).…”