People with the skin disease psoriasis are at increased risk for type 2 diabetes, and the more severe the psoriasis, the greater their risk, a new study finds.

Researchers examined data on nearly 85,000 adults in the United Kingdom, including 8,100 who had psoriasis. Compared with people who did not have psoriasis, the risk for diabetes was 21 percent higher among those with psoriasis on 2 percent or less of their body. It was 64 percent higher among those with psoriasis on more than 10 percent of their body.

For every 10 percent increase in body area with psoriasis, the risk for diabetes rose another 20 percent. For instance, people with psoriasis on 20 percent of their body had a nearly 84 percent increased risk for diabetes. And those with psoriasis on 30 percent of their body had a 104 percent increased risk, the study authors said.