I am a 62 yr. old woman with a small dark and scrape type, (like a knee scrape), DRY PATCH, does NOT itch or leak, above my upper lip and NEVER goes away. Not serious, just aggravating, and ugly. What form of dermatitis is it? How does one treat it when medicated cortizone or moisturizers do NOT work? I've been using an emery board to reduce the hard, unsightly, rash. (does not bleed).