Is psoriasis contagious? Also, I am very worried about why other people's psoriasis gets better in the summer, but mine doesn't. A survey of 10,404 patients with psoriasis found that among those experiencing an initial onset of skin lesions, 3,217 cases (30.92%) were in spring; 2,567 cases (24.67%) in summer; 2,220 cases (21.34%) in autumn; and 2,400 cases (23.07%) in winter. The proportion of cases starting in the spring is relatively high.