07/25/2011 at 04:45 PM EDT
She's known for looking fabulous and flawless, whether she's on the red carpet
or on a jog
. But Kim Kardashian
could only complain about her skin on Sunday night's Keeping Up with the Kardashians
After her dermatologist revealed she has a psoriasis, a treatable skin condition that her mom also has – and a different diagnosis than Khloé's theory that she had ringworm – Kardashian was told to take it easy and lead a "slower-paced life."
Her response: "It's just not possible."
"My career is doing ad campaigns and swimsuit photo shoots," the reality star, 30, explained on the episode. "People don't understand the pressure on me to look perfect."
She added: "When I gain a pound, it's in the headlines. Imagine what the tabloids would do to me if they saw all these spots?"