Accuracy of dermoscopic and reflectance confocal microscopic criteria for diagnosis of psoriasis

To the Editor:Psoriasis is a chronic inflammatory disease that is usually diagnosed on the basis of typical clinical features.However,ambiguous cases can exist at times and are sometimes mistaken for other erythematosquamous diseases.Although histopathologic diagnosis remains the gold standard in such cases,it is frequently bypassed to avoid damage to the lesion areas and reduce discomfort for patients.Because a biopsy cannot provide real-time monitoring,non-invasive techniques that are cost-effective,such as dermoscopy and reflectance confocal microscopy(RCM),have increasingly been used in clinical practice during the past few years.