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Family dynamics plays a major role in itch related dermatoses. The aim of the study was to evaluate the effectiveness of family constellation seminars (FCS) in the decrease of itch in atopic dermatitis (AD) and psoriasis. 31 adult patients with chronic itch (16 with AD and 15 with psoriasis) were allocated to intervention group (FCS + G) and control group (CG). Patients from FCS + G have participated in a series of 4 FCS for 3 months. During the study period, all patients used only emollients. Itch was evaluated by 27-item questionnaire and skin condition was evaluated by SCORAD and PASI. The severity of itch in FCS + G decreased (Median; [25%;75%]) from 8.42 (6.57;11.92) initially to 4.78 (1.36;9.14); p < 0.01 after 1 month and (0.61 [0;6.66]; p < 0.001) after 9 months after the psychological intervention with no significant changes in the CG. In the patients with AD in the FCS + G, SCORAD decreased (21.5 (14.4;40); 14.1 (7.3;15.5) p < 0.05; 7.2 (3.6;11); p < 0.05). In the FCS + G, itch decreased both in patients with AD and psoriasis, with less significant visible changes of skin in patients with psoriasis. Participation in FCS in a series of 4 seminars has high effect (r = 0.53) on reduction of itch and high effect (r = 0.74) on improvement of AD signs with lower effect on skin condition in patients with psoriasis for 4 months. Positive effect of FCS gradually increases during at least 9 months. Further studies for understanding FCS influence of on the patients with itch are needed. This article is protected by copyright. All rights reserved.