Diagnostic Pathology: Nonneoplastic Dermatopathology

Integument Normal Histology

Epidermis (Including Keratinocytes and Melanocytes)

Dermis

Adnexal Structures

Nail

Spongiotic and Psoriasiform Dermatoses

Atopic Dermatitis

Contact Dermatitis

Nummular Eczema

Asteatotic Eczema

Dyshidrotic Eczema

Id Reaction

Seborrheic Dermatitis

Pityriasis Rosea

Stasis Dermatitis

Lichen Simplex Chronicus

Prurigo Nodularis

Frictional Keratosis

Psoriasis

Zoon Balanitis

Reactive Arthritis

Parapsoriasis

Lichenoid and Vacuolar Interface Dermatoses

Lichen Planus

Lichenoid Keratosis

Erythema Multiforme and Related Disorders

Pigmented Purpuric Dermatoses

Lichen Sclerosus et Atrophicus

Graft-vs.-Host Disease

Pityriasis Lichenoides

Pityriasis Rubra Pilaris

Erythema Dyschromicum Perstans

Lichen Striatus

Lichen Nitidus

Phytophotodermatitis

Vesiculobullous Dermatoses

Bullous Pemphigoid

Pemphigus and Variants

Dermatitis Herpetiformis

Cicatricial Pemphigoid

Hailey-Hailey Disease

Epidermolysis Bullosa Acquisita

Epidermolysis Bullosa (Inherited)

Linear IgA Bullous Dermatosis

Erythema Toxicum Neonatorum

Transient Neonatal Pustular Melanosis

Acropustulosis of Infancy

Pemphigoid Gestationis

Bullous Diabeticorum

Palmoplantar Pustulosis

Erosive Pustular Dermatosis

Porphyria Cutanea Tarda

Vasculitis, Vasculopathy, and Perivascular Dermatoses

Leukocytoclastic Vasculitis

Granuloma Faciale

Erythema Elevatum Diutinum

Urticaria and Variants

Thrombotic Vasculopathy

Livedoid Vasculopathy

Polyarteritis Nodosa

Gyrate Erythemas

Giant Cell Arteritis

Pruritic Urticarial Papules and Plaques of Pregnancy

Granulomatosis With Polyangiitis

Eosinophilic Granulomatosis With Polyangiitis

Behçet Disease

Malignant Atrophic Papulosis

Livedo Reticularis

Thrombophlebitis

Pernio

Panniculitides

Erythema Nodosum

Lipodermatosclerosis

Traumatic Panniculitis

Eosinophilic Panniculitis

Erythema Induratum

Sclerema Neonatorum

Subcutaneous Fat Necrosis of the Newborn

Post-Steroid Panniculitis

Cold Panniculitis

Pancreatic Panniculitis

Connective Tissue/Soft Tissue Diseases

Keloid

Lupus Erythematosus and Variants

Morphea/Scleroderma

Dermatomyositis

Radiodermatitis

Eosinophilic Fasciitis

Nodular Fasciitis

Pseudoxanthoma Elasticum

Relapsing Polychondritis

Nephrogenic Fibrosing Dermopathy (Nephrogenic Systemic Fibrosis)

Atrophoderma

Favre-Racouchot Syndrome

Collagenous and Elastotic Marginal Plaques of the Hands

Erythema Ab Igne

Anetoderma

Cutis Laxa

Acrokeratoelastoidosis

Middermal Elastolysis

Degenerative and Perforating Diseases

Chondrodermatitis Nodularis Helicis

Perforating Dermatoses

Elephantiasis Nostras Verrucosa

Metabolic/Deposition Diseases

Acanthosis Nigricans

Confluent and Reticulated Papillomatosis

Amyloidosis

Colloid Milium

Calcinosis Cutis

Osteoma Cutis

Gout

Tattoo Ink

Reaction to Cosmetic Fillers

Silicone Reaction

Amalgam Tattoo

Argyria

Minocycline Deposition

Monsel Reaction

Calciphylaxis

Ochronosis

Lipoid Proteinosis

Necrolytic Migratory Erythema

Mucinoses

Focal Cutaneous Mucinosis

Myxedema

Papular Mucinosis

Scleredema

Reticular Erythematous Mucinosis

Mucocele

Cutaneous Myxoma

Follicular Mucinosis

Granulomatous Diseases

Sarcoidosis

Granuloma Annulare

Necrobiosis Lipoidica

Foreign Body Granuloma

Rheumatoid Nodule

Actinic Granuloma

Annular Elastolytic Giant Cell Granuloma

Melkersson-Rosenthal Syndrome

Necrobiotic Xanthogranuloma

Perioral Dermatitis

Lupus Miliaris Disseminatus Faciei

Cutaneous Crohn Disease

Interstitial Granulomatous Dermatitis

Palisaded Neutrophilic Granulomatous Dermatitis

Pilosebaceous Diseases

Folliculitis

Acne

Rosacea

Hidradenitis Suppurativa

Furuncle

Eosinophilic Pustular Folliculitis

Fox-Fordyce Disease

Chloracne

Miliaria

Alopecias

Androgenetic Alopecia

Telogen Effluvium

Trichotillomania

Alopecia Areata

Lichen Planopilaris

Discoid Lupus Alopecia

Central Centrifugal Cicatricial Alopecia

Folliculitis Decalvans

Acne Keloidalis Nuchae

Dissecting Cellulitis

Traction Alopecia

Hair Shaft Disorders

Trichothiodystrophy

Bubble Hair

Pili Torti

Pili Annulati

Trichorrhexis Nodosa

Lice/Nit

Hair Cast

Trichoptilosis

Reactions to Drugs

Cutaneous Reactions to Immune Checkpoint Inhibitors

Morbilliform Drug Reactions

Fixed Drug Eruption

Lichenoid Drug Eruptions

Photodrug Eruptions

Phototoxic Dermatitis

Acute Generalized Exanthematous Pustulosis

Drug Rash With Eosinophilia and Systemic Symptoms

Toxic Erythema of Chemotherapy

Psoriasiform Drug Eruptions

Disorders of Epidermal Maturation and Keratinization

Keratoderma

Grover Disease

Darier Disease

Porokeratosis

Ichthyosis

Epidermolytic Hyperkeratosis

Granular Parakeratosis

Incontinentia Pigmenti

Keratosis Pilaris

Circumscribed Acral Hypokeratosis

ILVEN

Disorders of Pigmentation

Vitiligo

Postinflammatory Pigment Alteration

Pityriasis Alba

Becker Nevus

Melasma

Idiopathic Guttate Hypomelanosis

Dowling-Degos Disease

Neutrophilic Dermatoses

Sweet Syndrome

Pyoderma Gangrenosum

Subcorneal Pustular Dermatosis

Neutrophilic Eccrine Hidradenitis

Nutritional Deficiencies

Necrolytic Acral Erythema

Pellagra

Scurvy

Acrodermatitis Enteropathica

Photosensitivity Dermatoses

Polymorphous Light Eruption

Chronic Actinic Dermatitis

Hydroa Vacciniforme

Bacterial Infections

Impetigo

Cellulitis

Necrotizing Fasciitis

Ecthyma Gangrenosum

Staphylococcal Scalded Skin Syndrome

Lyme Disease and Its Manifestations

Tuberculosis

Atypical Mycobacterial Infections

Leprosy

Cat Scratch Disease/Bacillary Angiomatosis

Nocardiosis and Actinomycosis

Rocky Mountain Spotted Fever

Rhinoscleroma

Ecthyma

Erythrasma

Cutaneous Malakoplakia

Botryomycosis

Spirochetal Diseases

Syphilis

Pinta

Yaws

Endemic Syphilis (Bejel)

Viral Infections

Gianotti-Crosti Syndrome

Viral Exanthem

Cutaneous Manifestations of COVID-19

Herpesvirus

Varicella/Herpes Zoster

Molluscum contagiosum

Epstein-Barr Virus Infections

Cytomegalovirus

Orf and Milkers Nodule

Hand, Foot, and Mouth Disease

Measles

Fungal Infections

Dermatophytosis

Majocchi Granuloma

Onychomycosis

Pityriasis (Tinea) Versicolor

Tinea Nigra

Candidiasis

Sporotrichosis

Coccidioidomycosis

Cryptococcosis

Histoplasmosis

Blastomycosis

Chromomycosis

Aspergillosis

Mucormycosis

Mycetoma

Paracoccidioidomycosis

Lobomycosis

Rhinosporidiosis

Phaeohyphomycosis

Talaromycosis (Penicilliosis)

Fusariosis

Arthropods/Parasites

Demodex Infestations

Bite Reactions

Scabies

Leishmaniasis

Larva Migrans and Currens

Onchocerciasis

Schistosomiasis

Dirofilariasis

Myiasis

Tungiasis

Pediculosis

Human Filariasis

Other

Cutaneous Endometriosis

Wells Syndrome

Thermal Injury

Black Heel

Accessory Tragus

Supernumerary Nipple

Cutaneous Lymphoid Hyperplasia

Adult-Onset Still Disease