Applying sunscreen is always a good idea. However, it becomes even more critical for you to apply sunscreen consistently when you have a Lymphoma rash. Sun exposure can cause symptoms to worsen, making the rash more itchy or painful. For the best possible results, avoid the sun as much as possible. Use wide-brimmed sun hats and lightweight, breathable clothing with long sleeves. When you use sunscreen, keep in mind that you’ll need one with an SPF of at least 50 in order for it to be effective. Additionally, make sure you apply it several times throughout the day to prevent flare-ups from getting worse.