Personality properties have an effect on the onset and triggering of psoriasis. The current study aimed to examine the personality of psoriasis patients in relation to the severity of the illness. Psoriasis and healthy participants completed the Beck Depression Inventory, Beck Anxiety Inventory, Maudsley Obsessive Compulsive Inventory, Temperament and Character Inventory. Severity of psoriasis was evaluated by the PASI. MANCOVA results revealed significantly higher Novelty Seeking, Harm Avoidance, Reward Dependence and Self-Transcendence scores for psoriasis group. Severity of PASI was predicted by harm avoidance and reward dependence. Personality properties should be evaluated while planning therapeutic interventions for psoriasis patients.