You can it use it on your own. And should not if you don't want damage on the skin.

No..Only by doctor.. Treatment depends on the grade..Do direct online consultation for detailed information by sending photo

Can be used at home but appropriate sterility should be maintained for treatment. It will create micro channels in your upper layer of skin ( epidermis ) which may be foci of infection . Do use gloves , use lil amount of spirit or betadine to cleanse the area and one can use it for hair and skin. Depending upon the effect required length of tje needle can be chosen. Do connect for further information