Welcome to Healthcare magic forum
There is no treatment for open pores. Just face clean, avoid too many skin care
products & cosmetics. Steam , while facial /cleanup should be avoided. Regualr blackhead
removal is adviced.
Moisturising twice a day. Using glycerin
based face wash/soap 1-2 times a day . Healthy , balanced diet and acitivity is useful for keeping the whole body cleansed and fit, espcially skin.
For pigmentation/marks , you can try homeopathy