Measures of periodontitis distance between the cemento‐enamel junction and alveolar bone crest (CEJ–ABC) and number of osteoclasts and psoriasis (epidermal thickness and infiltrate cells (per 0.03mm2)) severity, as well as systemic inflammation (IL‐6, IL‐17A and TNF‐α) were collected. This evidence concerns the gene IL17A and psoriasis.