Almost every patient can recover themselves from allergy; however, allergic reactions prevail and constantly occur in most cases. The consumption of drugs often leads to drowsiness, and can only prevent or relieve the symptoms, without curing the illness. As a result, allergy sometimes develops after discontinuing the medication.

The key and most significant method of allergy treatment is to avoid a particular allergen, so that the allergic reaction will cease and the patient can lead as normal a life as possible. One frequent cause of allergy is the allergen around the patient, such as dust mites, dust, pet fur, or they may be sensitive to changes in temperature or humidity. Dust mites are miniscule insects, invisible to naked eyes, and are often found in bed, pillow, mosquito net, carpet or chair. Although these insects die when exposed to sunlight, their remains are still an allergen. Consequently, it is critical to control the environment by reducing the number of dust mites.