 Baseline Demographics, disease characteristics and medication history prior to start of treatment with apremilast will be collected. Patients will be asked to complete baseline Dermatology Life Quality Index DLQI, Short Form 36 SF36, EuroQol-5 dimensions EQ5D, Treatment Satisfaction Questionnaire for Medication TSQM and Work Productivity and Activity Impairment WPAI questionnaires. Photographs of the finger nails will be taken. 