Ultraviolet light therapy is a new method newly developed in the 21st century to treat stubborn skin diseases. Ultraviolet light in the spectrum, according to its different biological action characteristics, can be divided into 3 wavelengths, namely long-wave ultraviolet, medium-wave ultraviolet, and short-wave ultraviolet. These ultraviolet rays, their ability to penetrate the skin is proportional to their wavelengths. That is, the longer the wavelength, the greater the penetrating ability to the skin. Usually, most of UVA can penetrate to the middle and lower dermis of the skin, only a small part of UVB can reach the upper part of the dermis, and UVC basically cannot reach the dermis. Therefore, the clinical use of
UVA, UVB treatment of dermatological diseases, UVC is basically not used. About the principle of UV therapy, it may be related to the following aspects of the role: 1, can improve the body’s resistance and stress capacity: UV can be through the human sympathetic nerve – adrenal gland system function to regulate endocrine function, improve metabolism, thereby enhancing the body’s resistance to disease and stress capacity. 2, can improve the body’s immune function, through small doses of UV radiation, can make the patient’s body immunoglobulin formation increased, can activate the complement, and make the phagocytic ability of leukocytes, macrophages, etc. strengthen, so as to improve the immune function. 3, can inhibit the proliferation of epidermal cells: within the lesions of chronic eczema, neurodermatitis, psoriasis and other diseases, there is a phenomenon of excessive proliferation of epidermal cell classification. Ultraviolet light can reduce the synthesis of deoxyribonucleic acid in those cells that are proliferating too fast, thus stopping the rate of cell sorting and proliferation. 4.Improve the blood circulation of the skin. UV radiation can be applied to the whole body or locally, depending on the specific situation. The dose of irradiation should be small at the beginning, and the situation will gradually increase. Since people’s sensitivity to UV light varies considerably, there is no relatively fixed dose table for reference. With repeated treatment, the sensitivity of the skin to ultraviolet light can gradually decrease, so the amount of irradiation should be gradually increased in order to maintain a good therapeutic effect. It has the advantages of fast onset, high efficiency, long remission period, safety and speed, no hospitalization, etc. It is the preferred treatment for psoriasis today. As a basic applied therapy, UV light therapy can treat many kinds of skin diseases, usually applied as an effective means for those stubborn, easily recurring and difficult to heal skin diseases. Indications: UV light therapy technology is an effective method for treating psoriasis, vitiligo, seborrheic dermatitis, atopic dermatitis, tumor-like granuloma, palmoplantar pustulosis, chronic dermatitis, neurodermatitis, pruritus, pityriasis rosea, eczema, herpes zoster and many other skin stubborn diseases.