As an AI language model, I don't have the capability to provide the latest ranking for psoriasis hospitals in Zhoukou or any other cities. However, I can provide some general guidance on how to choose a suitable hospital for psoriasis treatment.

When selecting a hospital for psoriasis treatment, it's important to consider the following factors:

1. Hospital reputation and specialty: Choose a hospital that has a good reputation for treating psoriasis and has a dedicated department for dermatology. Check online reviews, patient satisfaction rates, accreditation, and awards to evaluate the hospital's reputation.

2. Treatment options: Look for a hospital that offers various treatment options for psoriasis, including topical medications, oral medications, phototherapy, and biologic agents. Treatment plans should be personalized to suit the severity and type of psoriasis.

3. Expertise of doctors and staff: Experienced doctors and medical staff who specialize in dermatology can offer better treatment for psoriasis. Look for hospitals that have certified dermatologists and nursing staff with expertise in caring for people with psoriasis.

4. Facilities and amenities: A well-equipped hospital with advanced facilities and amenities can ensure better treatment outcomes for psoriasis patients. Look for hospitals that have modern equipment, comfortable patient rooms, and other amenities that can make the treatment process more comfortable.

5. Location and accessibility: Choose a hospital that is accessible and convenient for you to travel to. You may need to make frequent visits to the hospital for treatment, so proximity to your home or workplace can make the treatment process easier.

In summary, when choosing a hospital for psoriasis treatment, do your research and take all factors into consideration before making a decision. Ultimately, the right hospital can make a significant difference in the quality of treatment and life of someone living with psoriasis.