Adult T-cell leukemia/lymphoma
Angiocentric lymphoma (extranodal natural killer cell lymphoma, nasal-type NK lymphoma, NK/T-cell lymphoma, polymorphic/malignant midline reticulosis)
Angioimmunoblastic T-cell lymphoma (angioimmunoblastic lymphadenopathy with dysproteinemia)
Blastic NK-cell lymphoma
CD30+ cutaneous T-cell lymphoma (primary cutaneous anaplastic large cell lymphoma)
Cutaneous lymphoid hyperplasia (borrelial lymphocytoma, lymphadenosis benigna cutis, lymphocytoma cutis, pseudolymphoma, pseudolymphoma of Spiegler and Fendt, sarcoidosis of Spiegler and Fendt, Spiegler–Fendt lymphoid hyperplasia, Spiegler–Fendt sarcoid) 
Cutaneous lymphoid hyperplasia with bandlike and perivascular patterns
Cutaneous lymphoid hyperplasia with nodular pattern (nodular pattern of cutaneous lymphoid hyperplasia)
Diffuse large B-cell lymphoma (primary cutaneous large B-cell lymphoma)
Granulocytic sarcoma (chloroma, myeloid sarcoma)
Granulomatous slack skin
Hairy-cell leukemia
Hodgkins disease
Ichthyosis acquisita (acquired ichthyosis)
IgG4-related skin disease
Intravascular large B-cell lymphoma (angiotropic large cell lymphoma, intralymphatic lymphomatosis, intravascular lymphomatosis, malignant angioendotheliomatosis)
Jessner lymphocytic infiltrate of the skin (benign lymphocytic infiltration of the skin, Jessner lymphocytic infiltration of the skin, Jessner–Kanof lymphocytic infiltration of the skin, lymphocytic infiltrate of Jessner)
Kikuchis disease (histiocytic necrotizing lymphadenitis)
Large plaque parapsoriasis (parapsoriasis en plaques)
Lennert lymphoma (lymphoepitheliod lymphoma)
Leukemia cutis
Lymphoma cutis
Lymphomatoid granulomatosis
Lymphomatoid papulosis
Malignant histiocytosis (histiocytic medullary reticulosis)
Marginal zone B-cell lymphoma
Mucosa-associated lymphoid tissue lymphoma
Mycosis fungoides
Non-mycosis fungoides CD30− cutaneous large T-cell lymphoma
Nonspecific cutaneous conditions associated with leukemia (leukemid)
Pagetoid reticulosis (acral mycoses fungoides, localized epidermotropic reticulosis, mycosis fungoides palmaris et plantaris, unilesional mycosis fungoides, Woringer–Kolopp disease)
Pityriasis lichenoides chronica (chronic guttate parapsoriasis, chronic pityriasis lichenoides, dermatitis psoriasiformis nodularis, parapsoriasis chronica, parapsoriasis lichenoides chronica)
Pityriasis lichenoides et varioliformis acuta (acute guttate parapsoriasis, acute parapsoriasis, acute pityriasis lichenoides, Mucha–Habermann disease, parapsoriasis acuta, parapsoriasis lichenoides et varioliformis acuta, parapsoriasis varioliformis)
Plasmacytoma 
Plasmacytosis
Pleomorphic T-cell lymphoma (non-mycosis fungoides CD30− pleomorphic small/medium-sized cutaneous T-cell lymphoma)
Polycythemia vera (erythremia)
Primary cutaneous follicular lymphoma (follicular center cell lymphoma, follicular center lymphoma)
Primary cutaneous immunocytoma
Primary cutaneous marginal zone lymphoma
Retiform parapsoriasis
Secondary cutaneous CD30+ large cell lymphoma
Sézary syndrome
Sinus histiocytosis with massive lymphadenopathy (Rosai–Dorfman disease)
Subcutaneous T-cell lymphoma (panniculitis-like T-cell lymphoma)
Vesiculopustular eruption and leukemoid reaction in Down syndrome

Melanocytic nevi and neoplasms
Melanocytic nevi and neoplasms are caused by either a proliferation of (1) melanocytes, or (2) nevus cells, a form of melanocyte that lack dendritic processes.
Accessory nail of the fifth toe
Accessory tragus (ear tag, preauricular appendage, preauricular tag)
Amniotic band syndrome (ADAM complex, amniotic band sequence, congenital constriction bands, pseudoainhum)
Aplasia cutis congenita (cutis aplasia, congenital absence of skin, congenital scars)
Arteriovenous fistula
Benign neonatal hemangiomatosis
Branchial cyst (branchial cleft cyst)
Bronchogenic cyst
Capillary hemangioma (infantile hemangioma, nevus maternus, strawberry hemangioma, strawberry nevus)
Cavernous venous malformation
Congenital cartilaginous rest of the neck (cervical accessory tragus, wattle)
Congenital erosive and vesicular dermatosis
Congenital hypertrophy of the lateral fold of the hallux
Congenital lip pit (congenital sinus of the lower lip, lip sinus, midline sinus of the upper lip)
Congenital malformations of the dermatoglyphs
Congenital smooth muscle hamartoma
Cystic lymphatic malformation
Dermoid cyst
Diffuse neonatal hemangiomatosis
Encephalocele
Focal facial dermal dysplasia
Hutchinsons teeth
Hyperkeratotic cutaneous capillary-venous malformation
Intrauterine epidermal necrosis
Limb–mammary syndrome
Lowry–MacLean syndrome
Macrocheilia
Macrocystic lymphatic malformation
Malignant pilomatricoma (pilomatrical carcinoma, pilomatrix carcinoma)
Maternal autoimmune bullous disease
Median raphe cyst
Melanotic neuroectodermal tumor of infancy
Membranous aplasia cutis
Microcystic lymphatic malformation
Midline cervical cleft
Mongolian spot (congenital dermal melanocytosis, dermal melanocytosis) 
Mulberry molar
Nager acrofacial dysostosis
Nasal glioma (brain-like heterotopia, cephalic brain-like heterotopia, glial hamartoma, heterotopic neuroglial tissue, nasal cerebral heterotopia, nasal heterotopic brain tissue)
Nasolacrimal duct cyst
Nevus psiloliparus
Non-involuting congenital hemangioma
Omphalomesenteric duct cyst (omphalomesenteric duct remnant, vitelline cyst)
PELVIS syndrome
Pilomatricoma (calcifying epithelioma of Malherbe, Malherbe calcifying epithelioma, pilomatrixoma)
Poland anomaly
Posterior fossa malformations–hemangiomas–arterial anomalies–cardiac defects–eye abnormalities–sternal cleft and supraumbilical raphe syndrome (PHACE association, PHACES syndrome)
Preauricular sinus and cyst (ear pit, congenital auricular fistula, congenital preauricular fistula, preauricular cyst)
Rapidly involuting congenital hemangioma (congenital nonprogressive hemangioma)
Rosenthal–Kloepfer syndrome
Rudimentary supernumerary digit (rudimentary polydactyly)
SACRAL syndrome
Sinus pericranii
Skin dimple (skin fossa)
Superficial lymphatic malformation (lymphangioma circumscriptum)
Supernumerary nipple (accessory nipple, pseudomamma)
Thyroglossal duct cyst
Verrucous vascular malformation (angiokeratoma circumscriptum naeviforme)

Connective tissue diseases
Connective tissue diseases are caused by a complex array of autoimmune responses that target or affect collagen or ground substance.