When playing cucurbit silk, it is a normal physiological phenomenon that wrinkles appear at the corners of the mouth, which has nothing to do with the instrument itself. This phenomenon may be caused by muscle fatigue or excessive facial expression. Playing musical instruments for a long time may exercise facial muscles, which may lead to wrinkles.

However, this does not mean that blowing cucurbit silk will directly lead to the formation of wrinkles. In most cases, overstressing or being in a tense expression state for a long time, such as frowning or squinting, is the main factor leading to the formation of wrinkles.

So, if you find that blowing cucurbit silk wrinkles the corners of your mouth, you can try to adjust the posture and expression of playing, or take a proper rest to reduce muscle fatigue. In addition, keeping enough water and proper facial moisturizing can also help to reduce wrinkles.

Please note that the above information is for reference only. If you have any doubts or concerns about the formation of wrinkles, it is recommended to consult a professional dermatologist or cosmetic doctor, who can provide you with more specific suggestions and solutions.