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Psoriasis is prone to relapses and requires long-term therapy that may induce a range of adverse effects; therefore, an efficient and early detection of relapses is desirable. In this study, photoacoustic imaging and confocal laser scanning microscopic (CLSM) methods were investigated for their suitability in psoriasis follow-up examinations. Using a high-resolution photoacoustic system, the vascular structures of 11 psoriatic patients and 6 healthy volunteers were investigated. No differences were detected with respect to the average vessel diameter and vasculature per unit volume in the tissue of healthy volunteers and non-lesional and lesional skin areas of psoriatic patients. By means of CLSM, the diameters of the dermal papillae of 6 volunteers and 6 psoriatic patients were determined. The diameters of the dermal papillae of the healthy volunteers (0.074 ± 0.006 mm) revealed no significant difference when compared to non-lesional skin areas of psoriatic patients (0.079 ± 0.005 mm). The results obtained for the lesions in psoriatic patients showed a significant difference (Wilcoxon test, p = 0.028) between the diameters of the dermal papillae of the lesional skin areas (0.114 ± 0.012 mm) and the non-lesional skin areas (0.079 ± 0.005 mm). Thus, CLSM can be applied for monitoring psoriasis follow-up examinations.

Application of Photoacoustic Methods and Confocal Microscopy for Monitoring of Therapeutic Response in Plaque Psoriasis