In addition to skin tests, BCG vaccine, and insulin injections, 1ml syringes can function extensively in medicine.
In clinical work, medical personnel often coat patients with iodoglycerin to prevent or treat oral ulcers. In the past, operators often dipped the medicine with a cotton swab or cotton ball and applied it to the patient's ulcer or the infected area.
Due to the peculiarity of the drug itself, when the oily iodine glycerin is applied with a cotton swab, the drug will be wasted and uneven rubbing will occur. This will greatly reduce the drug's efficacy and prevent it from exerting its maximum pharmacology effect.