Use method of ultra-fine bubbles

[Problem] To improve the permeability of an external skin preparation such as a cosmetic to the skin. For example, when an external skin preparation containing a specific component suitable for the skin of the right hand (1R) is applied to the skin, a liquid containing ultra-fine bubbles is applied to the skin site to which the application is performed. The application of the liquid is performed, for example, before the skin external preparation is applied to the skin, by ejecting the ejected liquid by an aerosol container (10) having an ejection button (11) with a flow rate adjustment mechanism for adjusting the flow rate. 课题是提高化妆品等皮肤外用剂对皮肤的渗透性。解决手段是例如在对皮肤涂布含有适用于右手(1R)皮肤的特定成分的皮肤外用剂的情况下，在进行该涂布的皮肤部位，涂布含有超微细气泡的液体。液体的涂布是例如在将皮肤外用剂涂布到皮肤上之前，由具有带流量调整的流量调整机构的喷射按钮(11)的气溶胶容器(10)喷射出喷射液而进行的。