Childhood granulomatous periorificial dermatitis
Essential dermatitis

Atopic
Atopic dermatitis is a chronic dermatitis associated with a hereditary tendency to develop allergies to food and inhalant substances. Atopic dermatitis (atopic eczema, disseminated neurodermatitis, flexural eczema, infantile eczema, prurigo diathsique)

Contact
Contact dermatitis is caused by certain substances coming in contact with the skin. Abietic acid dermatitis
Acid-induced
Acrylic monomer dermatitis
Adhesive dermatitis
African blackwood dermatitis
Airbag dermatitis (airbag burn)
Alkali-induced
Allergic
Antifungal agent-induced
Antimicrobial agent-induced
Arsenic dermatitis
Artificial nail-induced
Axillary antiperspirant-induced
Axillary deodorant-induced
Baboon syndrome
Black dermatographism
Bleaching cream-induced
Capsaisin-induced
Chemical burn 
Chloracne
Chrome dermatitis
Clothing-induced
Cobalt dermatitis
Contact stomatitis (contact lichenoid reaction, lichenoid amalgam reaction, oral mucosal cinnamon reaction)
Contact urticaria
Corticosteroid-induced
Cosmetic dermatitis
Cosmetic intolerance syndrome
Dentifrice-induced
Dermatitis from metals and metal salts
Dust-induced
Epoxy resin dermatitis
Ethylenediamine-induced
Eye makeup-induced
Fiberglass dermatitis
Flower-induced
Formaldehyde-induced
Formaldehyde-releasing agent-induced
Fragrance-induced
Gold dermatitis
Hair bleach-induced
Hair dye-induced
Hair lotion-induced
Hair spray-induced
Hair straightener-induced
Hair tonic-induced
Houseplant-induced
Hydrocarbon-induced
Irritant folliculitis
Lacquer dermatitis (lacquer sensitivity)
Lanolin-induced
Lipstick-induced
Local anesthetic-induced
Makassar ebony dermatitis
Marine plant-induced
Mechanical irritant dermatitis
Mercury dermatitis
Mouthwash-induced
Nail lacquer-induced
Nail polish remover-induced
Nickel dermatitis
Occupation-induced
p-Chloro-meta-xylenol-induced
Paraben-induced
Paraphenylenediamine dermatitis
Permanent wave preparation-induced
Phenothiazine drug-induced
Photoallergic
Photoirritant
Plant derivative-induced
Pollen-induced
Polyester resin dermatitis
Propylene glycol-induced 
Protein contact dermatitis
Quaternium-15 hypersensitivity
Reed dermatitis
Rosewood dermatitis
Rosin dermatitis
Rubber dermatitis
Seed-induced
Shoe dermatitis
Solvent-induced
Sorbic acid-induced
Subjective irritant contact dermatitis (sensory irritant contact dermatitis)
Sunscreen-induced
Systemic contact dermatitis
Tear gas dermatitis
Textile dermatitis
Traumatic irritant contact dermatitis
Tree-associated plant-induced
Tree-induced
Tulip fingers
Urshiol-induced
Vegetable-induced

Eczema
Eczema refers to a broad range of conditions that begin as spongiotic dermatitis and may progress to a lichenified stage.
Aberrant basal cell carcinoma
Acanthoma fissuratum (granuloma fissuratum, spectacle frame acanthoma)
Acrospiroma (clear cell hidradenoma, dermal duct tumor, hidroacanthoma simplex, nodular hidradenoma, poroma)
Actinic keratosis (senile keratosis, solar keratosis)
Adenoid squamous cell carcinoma (pseudoglandular squamous cell carcinoma)
Aggressive digital papillary adenocarcinoma (digital papillary adenocarcinoma, papillary adenoma) 
Apocrine gland carcinoma
Apocrine nevus
Arsenical keratosis
Atrophic actinic keratosis
Balanitis plasmacellularis (balanoposthitis chronica circumscripta plasmacellularis, balanitis circumscripta plasmacellularis, plasma cell balanitis, plasma cell vulvitis, vulvitis circumscripta plasmacellularis, Zoons balanitis, Zoons erythroplasia, Zoons vulvitis)
Basal cell carcinoma
Basaloid follicular hamartoma
Basaloid squamous cell carcinoma
Birt–Hogg–Dubé syndrome
Bowens disease (squamous cell carcinoma in situ)
Brooke–Fordyce syndrome
Ceruminoma
Cicatricial basal cell carcinoma (morpheaform basal cell carcinoma, morphoeic basal cell carcinoma)
Ciliated cyst of the vulva (cutaneous Müllerian cyst, paramesonephric mucinous cyst of the vulva)
Clear cell acanthoma (acanthome cellules claires of Degos and Civatte, Degos acanthoma, pale cell acanthoma)
Clear cell squamous cell carcinoma (clear cell carcinoma of the skin)
Chronic scar keratosis (chronic cicatrix keratosis)
Clonal seborrheic keratosis
Common seborrheic keratosis (basal cell papilloma, solid seborrheic keratosis)
Cowden syndrome (Cowdens disease, multiple hamartoma syndrome)
Cutaneous ciliated cyst
Cutaneous columnar cyst
Cutaneous horn (Cornu cutaneum)
Cystic basal cell carcinoma
Dermal eccrine cylindroma (cylindroma)
Dermatosis papulosa nigra
Desmoplastic trichoepithelioma
Dilated pore (dilated pore of Winer) 
Eccrine carcinoma (syringoid carcinoma)
Eccrine nevus
Epidermal cyst (epidermal inclusion cyst, epidermoid cyst, infundibular cyst, keratin cyst)
Epidermal nevus syndrome (Feuerstein and Mims syndrome, Solomons syndrome)
Epidermolytic acanthoma
Epithelioma cuniculatum (Ackerman tumor, carcinoma cuniculatum)
Eruptive vellus hair cyst
Erythroplasia of Queyrat
Extramammary Pagets disease
Fibroepithelioma
Fibroepithelioma of Pinkus
Fibrofolliculoma
Follicular hybrid cyst (Hybrid cyst)
Folliculosebaceous-apocrine hamartoma (follicular-apocrine hamartoma)
Folliculosebaceous cystic hamartoma
Generalized eruptive keratoacanthoma (generalized eruptive keratoacanthoma of Grzybowski)
Giant solitary trichoepithelioma
Hidradenoma 
Hidradenocarcinoma
Hidrocystoma (cystadenoma, Molls gland cyst, sudoriferous cyst)
Hydrocarbon keratosis (pitch keratosis, tar keratosis, tar wart)
Hyperkeratosis lenticularis perstans (Flegels disease)
Hyperkeratosis of the nipple and areola
Hyperkeratotic actinic keratosis
Ichthyosis hystrix (ichthyosis hystrix gravior type Lambert, porcupine man, systematized verrucous nevus)
Ichthyosis hystrix of Curth–Macklin
Infiltrative basal cell carcinoma
Inflammatory linear verrucous epidermal nevus
Inverted follicular keratosis
Irritated seborrheic keratosis (basosquamous cell acanthoma, inflamed seborrheic keratosis)
Isthmicoma (infundibuloma, tumor of the follicular infundibulum)
Juvenile myelomonocytic leukemia
Keratin implantation cyst
Keratoacanthoma
Keratoacanthoma centrifugum marginatum
Large cell acanthoma
Lichenoid actinic keratosis
Lichenoid keratosis (benign lichenoid keratosis, lichen planus-like keratosis, solitary lichen planus, solitary lichenoid keratosis)
Linear verrucous epidermal nevus (linear epidermal nevus, verrucous epidermal nevus)
Malignant acrospiroma (spiradenocarcinoma)
Malignant mixed tumor (malignant chondroid syringoma)
Malignant trichilemmal cyst
Mantleoma
Marjolins ulcer
Melanoacanthoma (pigmented seborrheic keratosis)
Merkel cell carcinoma (cutaneous apudoma, primary neuroendocrine carcinoma of the skin, primary small cell carcinoma of the skin, trabecular carcinoma of the skin)
Microcystic adnexal carcinoma (sclerosing sweat duct carcinoma)
Micronodular basal cell carcinoma
Milia en plaque
Milium 
Mixed tumor (chondroid syringoma)
Mucinous carcinoma
Mucinous nevus (nevus mucinosus)
Muir–Torre syndrome
Multiple familial trichoepithelioma (Brooke–Spiegler syndrome, epithelioma adenoides cysticum)
Multiple keratoacanthomas (Ferguson–Smith syndrome, Ferguson-Smith type of multiple self-healing keratoacanthomas, multiple keratoacanthomas of the Ferguson–Smith type)
Multiple minute digitate hyperkeratosis (digitate keratoses, disseminated spiked hyperkeratosis, familial disseminated piliform hyperkeratosis, minute aggregate keratosis)
Nevoid basal cell carcinoma syndrome (basal cell nevus syndrome, Gorlin syndrome, Gorlin–Goltz syndrome)
Nevus comedonicus (comedo nevus)
Nevus comedonicus syndrome
Nevus sebaceous (nevus sebaceous of Jadassohn, organoid nevus)
Nevus unius lateris
Nodular basal cell carcinoma (classic basal cell carcinoma)
Pagets disease of the breast
Papillary eccrine adenoma (tubular apocrine adenoma)
Papillary hidradenoma (hidradenoma papilliferum)
Papillomatosis cutis carcinoides (Gottrons carcinoid papillomatosis, papillomatosis cutis carcinoides of Gottron–Eisenlohr)
Patch blue nevus (acquired dermal melanocytosis, dermal melanocyte hamartoma)
Perifollicular fibroma
Phakomatosis pigmentokeratotica
Pigmented actinic keratosis
Pigmented basal cell carcinoma
Pigmented hairy epidermal nevus syndrome
Pilar sheath acanthoma
Pilonidal sinus (Barbers interdigital pilonidal sinus, pilonidal cyst, pilonidal disease)
Porocarcinoma (malignant poroma, eccrine porocarcinoma)
Polypoid basal cell carcinoma
Pore-like basal cell carcinoma
Primary cutaneous adenoid cystic carcinoma
Proliferating epidermoid cyst (proliferating epithelial cyst)
Proliferating trichilemmal cyst (pilar tumor, proliferating follicular cystic neoplasm, proliferating pilar tumor, proliferating trichilemmal tumor)
Pseudocyst of the auricle (auricular endochondrial pseudocyst, cystic chondromalacia, endochondral pseudocyst, intracartilaginous cyst)
Pseudoepitheliomatous keratotic and micaceous balanitis
PUVA keratosis
Rasmussen syndrome
Reactional keratosis
Reticulated seborrheic keratosis (adenoid seborrheic keratosis)
Rodent ulcer (Jacobi ulcer)
Schimmelpenning syndrome (Schimmelpenning–Feuerstein–Mims syndrome)
Sebaceoma (sebaceous epithelioma)
Sebaceous adenoma
Sebaceous carcinoma
Sebaceous hyperplasia
Sebaceous nevus syndrome
Seboacanthoma
Seborrheic keratosis (seborrheic verruca, senile wart)
Seborrheic keratosis with squamous atypia
Signet-ring cell squamous cell carcinoma
Solitary keratoacanthoma (subungual keratoacanthoma)
Solitary trichoepithelioma
Spindle cell squamous cell carcinoma (spindle cell carcinoma)
Spiradenoma
Squamous cell carcinoma 
Steatocystoma multiplex (epidermal polycystic disease, sebocystomatosis)
Steatocystoma simplex (simple sebaceous duct cyst, solitary steatocystoma)
Stucco keratosis (digitate seborrheic keratosis, hyperkeratotic seborrheic keratosis, keratosis alba, serrated seborrheic keratosis, verrucous seborrheic keratosis)
Superficial basal cell carcinoma (superficial multicentric basal cell carcinoma)
Syringadenoma papilliferum (syringocystadenoma papilliferum)
Syringofibroadenoma (acrosyringeal nevus of Weedon and Lewis)
Syringoma
Systematized epidermal nevus
Thermal keratosis
Trichilemmal carcinoma
Trichilemmal cyst (isthmus-catagen cyst, pilar cyst)
Trichilemmoma
Trichoadenoma (trichoadenoma of Nikolowski)
Trichoblastoma
Trichoblastic fibroma
Trichodiscoma
Trichofolliculoma
Unilateral palmoplantar verrucous nevus
Urethral caruncle
Verrucous carcinoma
Verrucous cyst (cystic papilloma)
Viral keratosis
Warty dyskeratoma (isolated dyskeratosis follicularis)
Waxy keratosis of childhood (kerinokeratosis papulosa)
Zoons vulvitis
Zosteriform speckled lentiginous nevus

Erythemas
Erythemas are reactive skin conditions in which there is blanchable redness.