Wrinkles are a sign of skin aging, but they are not absolutely related to age. Young people can also develop wrinkles under adverse environmental or lifestyle conditions. Wrinkles can be categorized into pseudo wrinkles and qualitative wrinkles. False wrinkles are caused by lifestyle habits, such as not drinking enough water for a long time, or staying up late and losing enough nutrients or dehydration of the skin, all of which will cause small lines on the face. False wrinkles can be removed with maintenance. Qualitative wrinkles can also be formed without proper maintenance. So how do you check for fine wrinkles under the eyes and mouth? Here are some tips for you. The skin test and the skin elasticity test are usually used to examine the fine wrinkles of the eyes and mouth. In the skin test, the skin is pinched into folds with the hand and then released to observe how quickly the skin returns to its original state. If the skin elasticity is good, it will be restored immediately, while if the skin elasticity is reduced, it will not be easy to restore the original shape. Poor skin elasticity, poor skin elasticity is cellular elastic atrophy, skin accelerated aging and other skin problems. A positive test indicates that the patient has more than moderate dehydration present. It is mostly seen in hypertonic and isotonic dehydration due to various reasons. The longer the time taken to flatten after letting go of the skin, the more severe the degree of dehydration. Skin elasticity test, in the facial skin wrinkles increased patients in the inner forearm, routine disinfection, and then with an OT syringe, No. 4 injection needle inhalation of different kinds of allergens dip were injected into the inner forearm skin 0.02 ml, the distance between the antigen point for 2.5 cm. 15 ~ 20 minutes after the skin test, observation of the skin reaction, the size of the local air bubble and redness, compared with the control point.