How do you stop dilating Randy's anus in South Park?

In the episode "It Hits the Fan" from South Park, Randy Marsh's situation with dilating his anus is portrayed in a humorous and exaggerated manner. To "stop" the dilation, one might suggest that Randy needs to follow medical advice, seek psychological help, or simply stop engaging in the behavior that's causing the issue. Ultimately, the show's comedic approach means that any resolution would likely be absurd or over-the-top.