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DDx Strength:
Weak
Toenails, Rash or multiple lesions
Onychomycosis


Chronic mucocutaneous candidiasis


Onychogryphosis


Gout


Onycholysis


Psoriasis


Crusted scabies


Drug-induced pigmentation


Liver cirrhosis

Subacute bacterial endocarditis


Turf toe

Scopulariopsis


Acrodermatitis continua of Hallopeau

Chronic graft-versus-host disease


Cutaneous T-cell lymphoma


Darier disease


Erythrodermic psoriasis


Langerhans cell histiocytosis


Pustular psoriasis


Reactive arthritis


Scleroderma


Scytalidium dermatomycosis

Skin and oral mucosal manifestations of COVID-19

Yellow nail syndrome


Subungual exostosis


Acrokeratosis paraneoplastica


Arsenic poisoning


Dyschromatosis universalis hereditaria

Dyskeratosis congenita


Laugier-Hunziker syndrome


Retronychia

Warty dyskeratoma


Dermatopathia pigmentosa reticularis

Hidrotic ectodermal dysplasia


Olmsted syndrome

Richner-Hanhart syndrome


Postinflammatory hyperpigmentation


Onychoschizia


Tungiasis


Keratosis lichenoides chronica

Dystrophic epidermolysis bullosa


Postinflammatory hypopigmentation


Skin bacterial abscess


Generalized pustular psoriasis

Leukonychia


Nail polish damage


Splinter hemorrhage

Bacterial paronychia


Cutaneous squamous cell carcinoma


Dermatitis of nail folds


Ingrown toenail


Longitudinal melanonychia


Longitudinal nail ridging


Nail biting


Periungual wart


Subungual hematoma


Subungual wart


Drug-induced nail pigment


Koilonychia


Proximal subungual onychomycosis

