Why do people get solar dermatitis?
Nov 29, 2024
Source: Cainiu Health
Dr. Liu Wenmin
Introduction
Solar dermatitis is mainly caused by factors such as skin type and sensitivity, seasonal variations and light intensity, consumption of photosensitive foods, impaired skin barrier function, and drug induction. Individuals with different skin types and sensitivities to ultraviolet (UV) radiation vary; people with fair skin or those naturally sensitive to UV radiation are more prone to developing solar dermatitis. Pay attention to the UV index in weather forecasts.
Generally, solar dermatitis is mainly caused by factors such as skin type and sensitivity, seasonal and light intensity, ingestion of photosensitive foods, impaired skin barrier function, and drug-induced reactions. If discomfort occurs, please seek medical attention promptly. Detailed explanations are as follows:
1. Skin Type and Sensitivity
Individuals vary in skin type and sensitivity to ultraviolet (UV) radiation. People with fair skin or those naturally sensitive to UV rays are more prone to develop solar dermatitis. In daily life, protective measures against sunlight should be taken, such as using mild soaps for thorough skin cleansing, and avoiding harsh soaps or washing with hot water.
2. Season and Light Intensity
Ultraviolet radiation is stronger during summer and at high altitudes, particularly medium-wave ultraviolet (UVB) and long-wave ultraviolet (UVA). These UV rays can penetrate clouds and the atmosphere, directly affecting the skin and triggering inflammatory reactions. When spending prolonged time outdoors, sunscreen should be reapplied regularly, and the UV index in weather forecasts should be monitored.
3. Ingestion of Photosensitive Foods
Photosensitive substances, after being ingested, can circulate through the bloodstream and accumulate in the skin. Upon exposure to UV light, they may react with skin cell components, producing toxic substances that damage skin cells. Consumption of foods containing photosensitive compounds, such as celery and coriander, should be avoided.
4. Impaired Skin Barrier
When the skin barrier is compromised, the skin's defense against UV radiation decreases, making it more susceptible to solar dermatitis. Over-cleansing and the use of irritating cosmetics should be avoided. If necessary, medical dressings can be used for wet compresses.
5. Drug-induced Reactions
Certain medications, such as tetracycline antibiotics, nonsteroidal anti-inflammatory drugs, and antihypertensive drugs, may either increase photosensitivity or alter the skin's absorption of light, making it more vulnerable to UV damage and triggering photoreactions. During medication, exposure to strong sunlight should be avoided, and physical protection along with high SPF sunscreen is recommended.
In daily life, maintaining a balanced diet and consuming more foods rich in vitamin C, such as bananas, apples, and oranges, is advised to promote skin metabolism and repair.
