Itching is a common symptom in many skin diseases and is a manifestation of the disease. Itching is also a self-protective reaction of the body when foreign objects, such as insects, feathers, plants, physical, chemical, mechanical and other stimuli to the skin cause itching, pain and other abnormal sensations, through the skin nerve endings receptors to transmit various stimulus signals through the peripheral nerves to the brain, after the brain comprehensive analysis and issue defense instructions –Scratching or avoidance or other measures. However, scratching itself is also a mechanical stimulation of the skin, and a minor, momentary stimulation will not cause significant changes in the skin. In case of long-term, repeated strong mechanical stimulation, the skin has to react self-protectively – the skin at the stimulated area has to become thicker, from light to heavy, highly keratinized, mossy, or even chapped, warty, or even cancerous. Itching – scratching also tends to form a vicious circle, that is, the formation of itching – scratching – so that the skin thickens – -The thicker it is more itchy – and then more scratching to stop the itch – so that the skin is getting thicker and thicker. Itching is also getting worse. Scratching forms a habitual action, or even a conditioned reflex. To cure pruritic skin disease without interrupting scratching skin disease is difficult to cure. We all have experience, we labor after the palm of the hand will calluses, the longer the labor time, the thicker the hand calluses, do not labor, calluses will slowly fade away. This is a typical example of the skin’s self-protective response. From this point on, it also tells you why itchy skin should not scratch the reason. For the early recovery of your skin disease, control your hands, love your skin never scratch the skin, but I can tell you that some skin diseases can be controlled without scratching, without medication can also be good. What should I do if I’m itching? It is best to apply medicine to stop the itch. Anti-itch medicine contains mostly menthol, camphor, phenol, muscimol, doxepin, benzocaine, adrenal corticosteroids and other drugs. What kind of medicine to use? You need to consider the medication according to the nature and type of your skin disease and the specific situation, you need to go to the doctor to help you choose the right medicine for your disease. The medication is different for different diseases and different people. Don’t just use your own medicine, use the wrong one to aggravate the skin disease.