Objective evaluation of skin prick test reactions using digital photography

ssoftware. The accuracy and precision of this approach were also evaluated. Results: The digital photographic analysis measured the wheal and erythema sizes independent of the antigen or skin color with precision. In addition, a new variable of this test, the skin erythema intensity, could be determined objectively using the chromaticity of reflected light. Conclusions: Digital photographic analysis is a precise and objective method to evaluate the skin prick test reaction, which can be used independent of the patient’s skin color in clinical or research settings.