Clinical Research Directory

Inclusion Criteria: * To be eligible to participate in this registry, an individual must meet all of the following criteria: 1. Diagnosed with moderate-to-severe CHE by a dermatologist or other qualified healthcare provider at the time of enrollment and initiating an eligible medication. 2. Is at least 18 years of age or older and has attained the legal age for consent to procedures involved in the research, under the applicable law of the jurisdiction in which the research is being conducted at the time of enrollment 3. Is willing and able to consent to participation in the registry 4. Is willing and able to complete registry-related forms electronically via personal devices. 5. Is willing and able to provide the information (first name, last name, email address, language and primary time zone) required to create an account to allow you to complete registry forms via a personal device; 6. Is willing and able to provide Personal Information (full legal name, sex, date of birth, home address zip or postal code and email address or phone number at a minimum) if required based on registry location and applicable laws and regulations. Exclusion Criteria: An individual who meets any of the following criteria will be excluded from participation in the registry: 1\) Is participating or planning to participate in a blinded clinical trial for a CHE drug