<unk>  is a form of color blindness where only two of the three fundamental colors can be distinguished.
Dyschromatosis universalis
Keratosis pilaris
Linear atrophoderma of Moulin
Dyskeratosis congenita
Erythroplasia of Queyrat
X-linked ichthyosis
Dermatosis papulosa nigra
Pachyonychia congenita