Through one adolescent’s journey, this work will explore the meanderings of his psychical functioning and the diversity of his psoriasis expressions, conduct disorders, drug addiction – all of which are desperate attempts to check drive invasion and assure his psychical survival. The links between psoriasis and the protective shield on the one hand, and conduct disorders and destructiveness on the other, are investigated in order to understand the evolution of the psychotherapy and the psychical elaboration which underlies it.