Many factors have influenced overtreatment, it could be an inappropriate choice of the thickness of the needle along with an excess of current intensity. The tension of the hands in the area is another factor, our hands must keep the area stretched to minimize unnecessary damage on the walls of the follicle.
This past Monday I did some work for a Spanish machine manufacturer. The work was to select suitable parameters for different hair types in different areas of skin. One test was done in the beard of a man of 20 years.
The first picture shows the area before the test.
The second picture shows the area immediately afterward.
Notice the white spot was by an excess of current intensity.
The third picture shows the area today, 4 days after the test.
Tretinoin should be applied now. Some dermatologists apply tretinoin in an area that will receive a skin graft in the future. This is to prepare the skin to receive the graft and the healing progressed satisfactorily. Tretinoin remove the horny layer (whose function is to protect), the cells divide more quickly to recover the shortfall. Therefore, healing is faster.