Study Overview: This study looks at the long-term effects of two rare skin conditions, juvenile-onset mycosis fungoides *(jMF)* and lymphomatoid papulosis *(lyp)*. These conditions affect the skin and sometimes other parts of the body. The goal is to understand how people with these conditions are doing over time and what treatments they have tried.

Eligibility: To join, you must have been diagnosed with jMF or lyp before age 20. If you are under 18, your parents will provide information for the study. People diagnosed after age 20 cannot participate.

• Duration: This is a long-term study looking at outcomes over 5 to 10 years.
• Participation: It involves follow-ups to check your status and any treatments you've had.
• Risks: There are no direct risks involved in participating as it mainly involves sharing information.