Tissue Repository: CTCL Collection Protocol

This study is collecting blood and tissue samples from patients with cutaneous T-cell lymphoma (CTCL) — a rare type of cancer where abnormal immune cells accumulate in the skin — to help researchers find better ways to diagnose and treat it. **You may be eligible if...** - You have a clinical or confirmed lab diagnosis of CTCL or a related condition called Lymphomatoid Papulosis - You are newly diagnosed, have disease that is getting worse, or have had a relapse and are about to start or change treatment - You are 18 years or older and willing to sign a consent form **You may NOT be eligible if...** - You do not have a diagnosis of CTCL or a related skin lymphoma - You are unwilling to provide blood or tissue samples Note: Healthy volunteers matched by age and sex may also be enrolled as a comparison group. Talk to your doctor to see if this trial is right for you.