Acral nevus (melanocytic nevus of acral skin, melanocytic nevus with intraepidermal ascent of cells)
Amelanotic blue nevus (hypomelanotic blue nevus) 
Balloon cell nevus
Bannayan–Riley–Ruvalcaba syndrome
Beckers nevus (Beckers melanosis, Beckers pigmentary hamartoma, nevoid melanosis, pigmented hairy epidermal nevus)
Benign melanocytic nevus (banal nevus, common acquired melanocytic nevus, mole, nevocellular nevus, nevocytic nevus)
Blue nevus (blue neuronevus, dermal melanocytoma, nevus bleu)
Blue nevus of Jadassohn–Tièche (common blue nevus, nevus ceruleus)
Carney complex (LAMB syndrome, NAME syndrome)
Cellular blue nevus
Centrofacial lentiginosis
Congenital melanocytic nevus
Deep penetrating nevus
Dysplastic nevus (atypical mole, atypical nevus, B-K mole, Clarks nevus, dysplastic melanocytic nevus, nevus with architectural disorder)
Dysplastic nevus syndrome (B-K mole syndrome, familial atypical multiple mole–melanoma syndrome, familial melanoma syndrome)
Ephelis (freckle)
Epithelioid blue nevus
Generalized lentiginosis
Giant pigmented nevus (bathing trunk nevus, congenital nevomelanocytic nevus, garment nevus, giant hairy nevus, nevus pigmentosus et pilosus)
Halo nevus (leukoderma acquisitum centrifugum, perinevoid vitiligo, Sutton nevus)
Horis nevus (acquired bilateral nevus of Ota-like macules)
Inherited patterned lentiginosis in black persons
Ink spot lentigo (sunburn lentigo)
Laugier–Hunziker syndrome
Lentigo simplex (simple lentigo)
Malignant blue nevus
Medium-sized congenital nevocytic nevus
Melanoacanthoma
Melanocytic tumors of uncertain malignant potential
Moynahan syndrome
Mucosal lentigines (labial and penile and vulvar melanosis, melanotic macules)
Nevus of Ito (nevus fuscoceruleus acromiodeltoideus)
Nevus of Ota (congenital melanosis bulbi, melanosis bulborum and aberrant dermal melanocytosis, nevus fuscoceruleus ophthalmomaxillaris, oculodermal melanocytosis, oculomucodermal melanocytosis)
Nevus spilus (speckled lentiginous nevus, zosteriform lentiginous nevus)
Partial unilateral lentiginosis (segmental lentiginosis)
Peutz–Jeghers syndrome
Pigmented spindle cell nevus (pigmented spindle cell tumor of Reed, pigmented variant of Spitz nevus)
Pseudomelanoma (recurrent melanocytic nevus, recurrent nevus)
PUVA lentigines
Small-sized congenital nevocytic nevus
Spitz nevus (benign juvenile melanoma, epithelioid and spindle cell nevus, Spitzs juvenile melanoma)
Solar lentigo (lentigo senilis, liver spot, old age spot, senile freckle)

Melanoma
Melanoma is a malignant proliferation of melanocytes and the most aggressive type of skin cancer.
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.