1. ERP with application of cold gel face mask (Condition B) will be associated with faster reduction of visual analogue scales of Anxiety, Disgust, Strength of belief in obsession, Strength of urge to carry out the compulsion, Strength of belief in Theory A/B and an increase in Feeling of being supported, Readiness to face the fear compared to ERP as usual with simply resisting the compulsive behaviour (Condition C).