In an effort to overcome the aging or scar problems, a skin stimulator (so-called “microneedle roller”) has been proposed and used. The skin stimulator is provided with sharp needles which stimulate the skin and form microchannels in the skin, thus supplying nutritive elements, such as vitamin or peptide required to produce collagen, to the dermis and epidermis of the skin and making the collagen be efficiently produced in the dermis. This type of treatment is entitled microneedling treatment. Microneedling treatment is attaining popularity as an alternative to skin resurfacing treatment such as laser or chemical peels for the patients not suitable for laser treatment or wishing to have a less invasive procedure with fewer risks. When choosing a proper treatment modality for skin rejuvenation, it is important to have a balance between the degree of injury (downtime) and the outcome (best result). Microneedling treatment is a very well balanced technique which has the minimum downtime and a visible long lasting effect.