Differential Diagnosis
DDx Strength: Good
Multiple skin lesions, Chronic duration lasting years, History of Diabetes mellitus type 2, Hyperpigmented patch, Neck, 50-59 year old Male Add or remove findings

Acanthosis nigricans

Acanthosis nigricansAcanthosis nigricans

Solar lentigo

Solar lentigoSolar lentigo

Tinea corporis

Tinea corporisTinea corporis

Tinea versicolor

Tinea versicolorTinea versicolor

Atopic dermatitis

Atopic dermatitisAtopic dermatitis

Lichen planus pigmentosus

Lichen planus pigmentosus

Exogenous ochronosis

Exogenous ochronosisExogenous ochronosis

Folliculitis

FolliculitisFolliculitis

Ashy dermatosis

Ashy dermatosisAshy dermatosis

Tinea nigra

Tinea nigraTinea nigra

Pellagra

PellagraPellagra

Café au lait spot

Café au lait spotCafé au lait spot

Postinflammatory hyperpigmentation

Postinflammatory hyperpigmentationPostinflammatory hyperpigmentation

Skin abscess

Skin abscessSkin abscess

Alstrom syndrome

Alstrom syndromeAlstrom syndrome

Cultural practices

Cultural practicesCultural practices

Lichen planus

Lichen planusLichen planus

Intertrigo

IntertrigoIntertrigo

Psoriasis

PsoriasisPsoriasis

Acne keloidalis nuchae

Acne keloidalis nuchaeAcne keloidalis nuchae

Poikiloderma of Civatte

Poikiloderma of CivattePoikiloderma of Civatte

Idiopathic eruptive macular pigmentation

Idiopathic eruptive macular pigmentation

Melasma

MelasmaMelasma

Cutaneous T-cell lymphoma

Cutaneous T-cell lymphomaCutaneous T-cell lymphoma

Variegate porphyria

Variegate porphyriaVariegate porphyria

Alopecia mucinosa

Alopecia mucinosaAlopecia mucinosa

Hemochromatosis

HemochromatosisHemochromatosis

Multiple endocrine neoplasia type 1

Multiple endocrine neoplasia type 1Multiple endocrine neoplasia type 1

Drug-induced pigmentation

Drug-induced pigmentationDrug-induced pigmentation

Sarcoidosis

SarcoidosisSarcoidosis

Minocycline drug-induced pigmentation

Minocycline drug-induced pigmentationMinocycline drug-induced pigmentation

Urticaria pigmentosa

Urticaria pigmentosaUrticaria pigmentosa

Acroangiodermatitis

AcroangiodermatitisAcroangiodermatitis

Pityriasis rotunda

Pityriasis rotunda

POEMS syndrome

POEMS syndromePOEMS syndrome

Segmental neurofibromatosis

Segmental neurofibromatosisSegmental neurofibromatosis

Dyskeratosis congenita

Dyskeratosis congenitaDyskeratosis congenita

Epidermodysplasia verruciformis

Epidermodysplasia verruciformisEpidermodysplasia verruciformis

Reticulate acropigmentation of Kitamura

Reticulate acropigmentation of Kitamura

Glucagonoma syndrome

Glucagonoma syndromeGlucagonoma syndrome

Scleredema

ScleredemaScleredema

Actinic granuloma

Actinic granulomaActinic granuloma

Actinomycosis

ActinomycosisActinomycosis

Blastomycosis

BlastomycosisBlastomycosis

Porphyria cutanea tarda

Porphyria cutanea tardaPorphyria cutanea tarda

Hailey-Hailey disease

Hailey-Hailey diseaseHailey-Hailey disease

Amiodarone drug-induced pigmentation

Amiodarone drug-induced pigmentationAmiodarone drug-induced pigmentation

Fixed drug eruption

Fixed drug eruptionFixed drug eruption

Fanconi anemia

Fanconi anemiaFanconi anemia

Annular lichenoid dermatitis of youth

Annular lichenoid dermatitis of youth

Cutaneous collagenous vasculopathy

Cutaneous collagenous vasculopathy

Dermatopathia pigmentosa reticularis

Dermatopathia pigmentosa reticularis

PAPA syndrome

PAPA syndrome

Pseudoxanthoma elasticum

Pseudoxanthoma elasticumPseudoxanthoma elasticum

Prurigo nodularis

Prurigo nodularisPrurigo nodularis

Black dermographism

Black dermographism

Drug-induced phototoxic reaction

Drug-induced phototoxic reactionDrug-induced phototoxic reaction

Ochronosis

OchronosisOchronosis

Macular amyloidosis

Macular amyloidosisMacular amyloidosis

Cutis rhomboidalis nuchae

Cutis rhomboidalis nuchaeCutis rhomboidalis nuchae