In my experience, an enlarged (dilated, patulous) pore(s) can be narrowed or closed entirely by inserting a very fine, insulated electrode that transmits a rapid, short radiofrequency current that generates just enough heat to irritate the lining of the pore, which then tightens or closes...
The area which has not been treated will continue to have hair growth as normal whereas the area which was treated effectively with the IPL will not have hair growth. In order to receive the full benefit of the IPL treatments you should continue with the treatments on a regular basis.