The induction of psoriasis as a side effect of treatment with TNF-alpha 
inhibitors is one of a few rare complications of treatment, the pathogenic 
mechanism of which has not yet been completely clarified. The clinical 
presentation of these reactions may show the typical characteristics of 
psoriasis, palmoplantar pustulosis and psoriasiform exanthema; the individual 
variations of which may combine to give different presentations in individual 
patients. We present the case of a patient who, after administration of 
infliximab indicated for Crohn's disease, developed not only skin manifestations 
but also those of psoriatic arthritis.