Clobetasol does not cause erectile difficulties. Neither does vitiligo. I don't know how to explain "redness." I advise you to consult a dermatologist about the redness, and a doctor who deals with sexual dysfunction about your sexual difficulties. There may be many reasons for these, including concern over vitiligo and the use of clobetasol, but neither concern has any basis. You will need to get past them, and you'll need help to do so. Two years is too long to have waited.
Good luck.
Dr. Rockoff