“…Propolis was almost exclusively an occupational contact allergen in bee‐keepers until recently, when the number of cases of propolis‐induced allergic reactions (localized allergic contact dermatitis, cutaneous reactions, and, less frequently, systemic reactions) increased. This increase in propolis‐related adverse events is attributed to the growing popularity of “natural products”, which are generally perceived by consumers as safe and without side‐effects.…”