First, psoriasis disease does not have the conditions for the occurrence of infection. According to psoriasis experts for many years of tracking research found: psoriasis is a stubborn skin disease, but the cause of its pathogenesis and infectious factors – bacteria, fungi, parasites, etc. do not have any relationship, it can be seen, psoriasis disease does not occur in the conditions of infection. Second, psoriasis is not contagious this view currently in the medical community no one to dispute. And the medical profession has conducted some experiments, such as psoriasis lesions moved on the skin of healthy people, but this time also did not occur psoriasis contagious phenomenon, it can be seen, psoriasis is not contagious is supported by medical experiments, with scientific. The actual fact is that there is no contagion from the clinical practice of observing psoriasis. Experts have followed up and investigated nearly a thousand patients, especially between couples of psoriasis patients, no cases of infection between couples were found. Some psoriasis patients have lived with their significant other for more than 20 years without transmitting the disease to the other person, which can fully explain that psoriasis disease is not contagious among the population.