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Intake of proton pump inhibitors is a rare cause but should be considered in the differential diagnosis of hepatitis of uncertain etiology.

Chronic itch (or pruritus) is a symptom of many underlying diseases, but clinically it is often not easy to determine the exact cause. The aim of this study was to determine whether a specific skin test, the intracutaneous histamine test, can differentiate between various potential causes of chronic itch. The results showed that the histamine test might indicate when there is a cause of chronic itch in the field of systemic, internal diseases. In addition, there were differences between male and female patients regarding the test reaction pattern. Chronic pruritus can be a diagnostic sign of an underlying disease. In the intracutaneous histamine test, histamine (one of the best-known inducers of pruritus) may cause different reaction patterns depending on the underlying disease. The aim of this study was to determine if an intracutaneous injection of histamine can differentiate between the causes of chronic pruritus and thus be used as a diagnostic test in chronic pruritus of unknown aetiology. A total of 140 subjects with chronic pruritus with various dermatological, systemic or neurological diseases were included. The intracutaneous histamine test was performed once on each subject. Erythema, wheal and pruritus intensity were measured and analysed. Significantly greater wheal size was observed in patients with systemic or multifactorial causes. In general, there was a significant correlation between age and wheal size. Also, noticeable differences were found between males and females regarding pruritus and wheal size. In summary, the exact type of chronic pruritus could not be clearly determined based on the results of the intracutaneous histamine test. However, the results provide valuable insights into specific reaction patterns to experimental histamine-induced itch, e.g. sex-specific differences in the neurophysiology of pruritus, which should be considered in future studies.

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