This study is looking at the safety of a treatment called CC-93538 for people with a condition called eosinophilic esophagitis (EoE). EoE is a condition where the esophagus, the tube that carries food from the mouth to the stomach, gets swollen because of too many white blood cells called eosinophils. The study will include people who have been part of earlier studies with CC-93538. They want to see if the treatment is safe over a long time and how well people can handle it.

To be part of the study, you must have been in one of the earlier CC-93538 studies and followed the treatment rules. You shouldn't have any other health issues that could make the study results unclear. If you are a female who can have babies, you need to be sure you are not pregnant and use birth control during the study.

• The study is open-label, meaning everyone knows what treatment they are getting.
• You must have been part of the CC-93538-EE-001 or CC-93538-DDI-001 studies before.
• There are important health checks and rules to follow to join and stay in the study.