a. Ichthyosis
1. Ichthyosis vulgaris
2. X-linked ichthyosis
3. Bullous congenital ichthyosiform erythroderma (BCIE)
4. Ichthyosis bullosa of Siemens
5. Nonbullous congenital ichthyosiform erythroderma (NBCIE)
6. Lamellar ichthyosis
7. Harlequin ichthyosis
8. Ichthyosis syndrome

b. Palmoplantar keratoderma
1. Thost-Unna palmoplantar keratoderma
2. Vörner palmoplantar keratoderma
3. Mal de Meleda
4. Dominant Meleda palmoplantar keratoderma
5. Keratosis palmoplantaris transgrediens Nagashima
6. Keratosis palmoplantaris linearis/striata
7. Punctate palmoplantar keratoderma
8. Keratosis palmoplantaris mutilans (Vohwinkel)
9. Papillon-Lefévre syndrome
10. Richner-Hanhart syndrome
11. Náxos disease

c. Other hereditary keratoses
1. Darier’s disease
2. Erythrokeratodermia

a. Inflammatory keratosis
1. Psoriasis
1) Psoriasis vulgaris
2) Guttate psoriasis
3) Pustular psoriasis
4) Psoriatic erythroderma
5) Psoriatic arthritis
2. Pityriasis rubra pilaris
3. Parapsoriasis en plaque
1) Small-plaque parapsoriasis
2) Large-plaque parapsoriasis
4. Pityriasis lichenoides
5. Lichen planus
6. Lichen striatus
7. Lichen nitidus
8. Pityriasis rosea (Gibert)
9. Acquired ichthyosis

b. Noninflammatory keratoses
1. Clavus
2. Callus
3. Lichen pilaris
4. Erythromelanosis follicularis faciei (Kitamura)
5. Lichen spinulosus
6. Acanthosis nigricans (AN)
7. Confluent and reticulated papillomatosis
8. Bazex syndrome
9. Keratosis follicularis squamosa (Dohi)
10. Pityriasis circinata (Toyama)
11. Hyperkeratosis lenticularis perstans