Whether the thin shoulder needle has side effects is related to many factors. Because the quality of botulinum toxin is not up to standard, the injection of thin shoulder needle is not up to standard, which will have different side effects. Inferior botulinum toxin can lead to muscle weakness and arm weakness, and excessive injection or high concentration will produce side effects of muscle atrophy. If the injection is not accurate, it will easily lead to asymmetry on both sides of the shoulder and the exposed shoulder will be unnatural. If you want to gain more authoritative knowledge of medical beauty, you need lemon to love beauty.