Step 1 → Musculoskeletal, Skin, and Connective Tissue Pigment and Genetic SkinPreview this topic sectionPreview the conditions. Plans unlock the full Step 1 details when you need them. Free Biochemistry Free Microbiology Plans Pigment and Genetic Skin conditions Albinism Ichthyosis vulgaris Melasma (chloasma) Vitiligo Waardenburg syndrome