### What is Phototherapy? Phototherapy, also known as light therapy, uses ultraviolet (UV) rays to treat various health conditions, particularly skin disorders. ### How Does It Work? Phototherapy involves exposing the skin to specific wavelengths of light. The most common types are UVA and UVB rays. These rays can reduce inflammation, soothe itchy skin, and help the skin produce more vitamin D. ### Conditions Treated by Phototherapy - **Eczema:** UVB light is commonly used to calm inflammation and reduce itching. - **Psoriasis:** PUVA therapy, which combines UVA light with a plant-derived substance called psoralen, is effective for severe cases. - **Vitiligo:** UVB light can help repigment the skin. - **Jaundice in Babies:** Blue-green light helps break down excess bilirubin in the blood. ### Types of Phototherapy Devices - **Lamps and Light Boxes:** Used at home or in clinics, these devices emit UV light. - **Handheld Devices:** Portable options for targeted treatment. ### Safety and Side Effects - **Initial Reactions:** Skin may become red or itchy after treatment. - **Long-term Risks:** Overexposure can increase the risk of skin cancer. Always follow your doctor's recommendations and avoid non-prescribed sources of UV light like tanning beds. ### When to Avoid Phototherapy - **Certain Medications:** Some topical drugs can make your skin more sensitive to UV light. - **Medical Conditions:** Consult your doctor if you have any concerns about the safety of phototherapy for your specific condition.