| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Villonodular synovitis of unspecified site | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Villonodular synovitis of other specified site | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Villonodular synovitis of other tarsal joint | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Villonodular synovitis NOS | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Hyperpigmentation of skin | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Parasitic melanoderma | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Post-inflammatory hyperpigmentation | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Senile melanoderma | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Chloasma traumaticum | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Chloasma caloricum | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Zosteriform reticulate hyperpigmentation | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Chloasma toxicum | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Chloasma bronzinum | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Cantu's syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Talon noir | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Addison melanoderma | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Chloasma cachecticorum | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Melasma gravidarum | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Drug-induced melasma | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Arsenic-induced skin pigmentation | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Symptomatic chloasma | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Melanoderma | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Chloasma NOS | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Reticulate acropigmentation of Kitamura | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Penile hypermelanosis | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Idiopathic chloasma | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Melanoderma cachecticorum | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Symmetrical dyschromatosis of extremities | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Chloasma hepaticum | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Hyperchromic lesions of pinta | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Calcaneal petechiae | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Periorbital hypermelanosis | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Vulvovaginal hypermelanosis | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Hypermelanosis of the eyelids due to hyperthyroidism | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 3 | 
| Chloasma | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital hyperpigmentation | Is a | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier |  | 
| Melanosis | Is a | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier |  | 
| Achromic AND hyperchromic skin lesions of pinta | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 4 | 
| Lichen planus pigmentosus | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 3 | 
| X-linked reticulate pigmentary disorder with systemic manifestation syndrome | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Terminal osseous dysplasia and pigmentary defect syndrome | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 4 | 
| Increased melanin pigmentation | Is a | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier |  | 
| Circumscribed hypermelanosis | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Dermatopathia pigmentosa reticularis | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| X-linked reticulate pigmentary disorder with systemic manifestation syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Pseudoleprechaunism syndrome Patterson type | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Extrasystoles, short stature, hyperpigmentation, microcephaly syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Carney complex, trismus, pseudocamptodactyly syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 3 | 
| Terminal osseous dysplasia and pigmentary defect syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Carney complex | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Inherited cutaneous hyperpigmentation | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Neuroectodermal melanolysosomal disease | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Dyschromatosis universalis | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Naegeli-Franceschetti-Jadassohn syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Thumb deformity, alopecia, pigmentation anomaly syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Gastrocutaneous syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Pigmented hairy epidermal nevus of left lower limb | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Pigmented hairy epidermal nevus of right lower limb | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Pigmented hairy epidermal nevus of right upper limb | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Pigmented hairy epidermal nevus of left upper limb | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Pigmented hairy epidermal nevus of trunk | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Dermopathy due to type 2 diabetes mellitus | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Pretibial pigmental patches due to diabetes mellitus | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Dermopathy due to diabetes mellitus | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Thick skin syndrome due to diabetes mellitus | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Rubeosis faciei due to diabetes mellitus | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Osteopathia striata, pigmentary dermopathy, white forelock syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Dermopathy due to type 1 diabetes mellitus | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Pretibial pigmental patches due to diabetes mellitus | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Acquired acanthosis nigricans | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Acanthosis nigricans due to type 2 diabetes mellitus | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Hyperpigmentation of eyelid | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Progressive cribriform and zosteriform hyperpigmentation | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Palmoplantar hyperkeratosis-hyperpigmentation syndrome of Cantu | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 3 | 
| Neurofibromatosis type 1-like syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Severe growth deficiency, strabismus, extensive dermal melanocytosis, intellectual disability syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Intrauterine growth restriction, congenital multiple café au lait macules, increased sister chromatid exchange syndrome | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Neurofibromatosis type 6 | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Skin graft hyperpigmentation | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 3 | 
| Laser-induced hyperpigmentation | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 2 | 
| Hyperpigmentation of right eyelid and periocular area | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Hyperpigmentation of right lower eyelid and periocular area | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Hyperpigmentation of left eyelid and periocular area | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Hyperpigmentation of left lower eyelid and periocular area | Associated morphology | True | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 | 
| Chloasma NOS | Associated morphology | False | Hyperpigmentation | Inferred relationship | Existential restriction modifier | 1 |