Khan disease diagnosis of keratosis

1. Occur in exposed positions, For example, cheek, nose and limbs extended surface. But any site including mucosa may occur. 2. The primary damage for keratosis papules, after the surrounding expansion, the central mild atrophy, with dry, smooth small, grate hair disappeared, its edge is a narrow, gray significant uplift processes or Rough , the distinctive realm. 3. No subjective symptoms, the more after leaving or leave minor atrophy spot. 4. Lichen Planus to identify with the ring, the latter edge smooth, purplish red; consciously.