“Erythroderma, or capillary dilation, is a type of vascular damage to the skin that occurs on the face, mostly acquired, but also congenital in some patients. Facial capillary dilation is a common cause of cosmetic problems, mostly occurring on the face of women, and manifests clinically as punctate, stellate or flaky erythema of the face. On closer inspection one can see many red blood vessels on the skin, like a thread of red. There are many reasons for capillary dilation, such as living in a harsh living environment for a long time, excessive sun exposure, dry skin, facial abuse of topical medications (such as skin relaxation, dermatitis, dermatologic cream), abuse of cosmetics, or suffering from a certain skin disease (such as rosacea), etc. There are also some people whose reasons are not clear. With this skin problem, the face is very easy to redden, such as heat, emotional excitement, strenuous exercise or drinking, not only will the color deepen, and the whole face will be flushed (i.e. red face, “Guan Gong face”), it is difficult to subside, affecting the beauty. Conventional treatment of capillary dilation is usually ineffective, and medications can hardly do anything. Because the lesions are usually deep and located within the epidermis, they are difficult to remove with conventional treatments (e.g., freezing, electrolysis). If the treatment is too shallow to remove the lesions, it will definitely leave purpura marks if you want to achieve the desired depth of treatment. Some beauty salons in the society use cosmetic or mask package monthly treatment due to lack of medical knowledge, hoping to remove the dilated capillaries. This is impossible, instead it will get heavier and heavier. How does laser treat capillary dilation? The green laser emitted by the current advanced pulsed dye laser, etc., which is specially designed to treat vascular diseases, penetrates the skin above the lesion area extremely smoothly and enters the lesion area and treats the blood vessels in the lesion area. During the treatment, the hemoglobin inside the blood vessels is completely coagulated by the powerful laser. These coagulated hemoglobins close the abnormal blood vessels, and as a result, the diseased blood vessels disappear and are thus cured. Since this laser hardly damages the skin, there is no purple scar left behind during the treatment and the skin color is completely restored. This treatment is very effective, and you will be very happy when you find that the original dilated capillaries mysteriously disappear with a flash of green light during the treatment, because this is the beginning of your original appearance. Due to the severity of the dilated blood vessels in some patients, even with the best efforts of the physician, some of the vessels may not be treated. In addition, after treatment, a small number of blood vessels may recirculate, so after treatment, some skin may still have capillary residue and need to be treated again, preferably at an interval of 3 months between treatments. How does intense pulsed light treat capillary dilation? Intense pulsed light (photorejuvenation) can also treat dilated facial capillaries. In fact, it has many advantages in the treatment of facial capillary dilation: the treatment is less painful, the edema and redness of the skin after treatment are much less, so the treatment basically does not affect the commute to work. The disadvantage is that the energy of the treatment is not as strong as that of laser, and the treatment may require 4-5 times with an interval of 3 weeks each time.