Does cowhide infect others?

Most skin diseases are transmitted through contact with the patient's skin. Since the occurrence of these diseases is caused by external virus infection, the external virus will come on after invading the skin. But the pathogenesis of psoriasis and other infectious diseases are different, psoriasis is through their own abnormal blood circulation, and caused by the disease, due to this internal blood circulation caused by abnormal disease, is not through external skin contact or public goods and be infected, so psoriasis is a certain genetic, but it will not be transmitted to others.