Article in English: If you have a cold sore, prop a few pillows behind your head at bedtime to let gravity help the blisters drain. Otherwise, fluid may settle in sore during the night. The pillow for your head should support the natural curve of your neck and be comfortable. A pillow that's too high can put your neck into a position that causes muscle strain on your back, neck, and shoulders. Choose a pillow that will keep the neck aligned with the chest and lower back. Exercising several times a week or—even better—every day can help boost your immune system, thereby reducing the risk of recurring outbreaks of cold sores. Even mild to moderate exercises such as walking, yoga, and stretching have incredible general benefits, in addition to reducing the recovery period and alleviating your cold sore symptoms.  Regular exercise also reduces the risk of infection over the long term besides elevating your mood to decrease stress levels. A daily 30 to 45-minute workout with moderate intensity exercises, such as brisk walking, jogging, and swimming, is recommended. Consider consulting with a physician to help you come up with a personalized exercise plan. Moderate sun exposure is beneficial for your immune system due to the increased production of vitamin D. However, one of the most common triggers of cold sores is sunlight, so regularly using sunblock and a lip balm with an SPF (sun protection factor) when you head outside can help reduce the risk of cold sore breakouts. To protect your skin from sun damage, use a non-comedogenic sunscreen with a minimum SPF of 30. Some chemicals in sunscreens may cause allergies, so it's best to consult with a dermatologist to find the sunscreen that’s right for you. Cold sore breakouts can increase stress and cause low self-esteem, anxiety, and depression. By the same token, stress weakens our immune system and thus makes us more susceptible to developing viral infections, including herpes simplex. Some ways to manage stress include:  Try journalling. Set aside time to write down your thoughts...

Summary in Vietnamese:
Gối cao đầu khi ngủ. Tập thể dục đều đặn. Dùng kem chống nắng và son dưỡng môi chống nắng. Kiểm soát stress. Tránh hôn và quan hệ tình dục bằng miệng.