Yes. A lot of people have removed acne pimples and dark spots this way.
It may appear that acne is a result of too much internal fire (inflammation). In fact, it is caused by too much cold in the body that cannot get released due to meridian blockages.
You can slap on the inner elbows, Dazhui acupoint, chest, back, along the spine and the back of the legs where there are Urinary Bladder Meridians. For better effect, do Lajin on a bench as well. Moreover, avoid drinking cold water and beverages, eat less meat, fewer fruits and raw vegetables which are cold in nature.