Differential Diagnosis
DDx Strength: Excellent
Blanching macule, Widespread, Arthralgia, 50-59 year old Female Add or remove findings

Best Match is in Consider 2nd

Human immunodeficiency virus primary infection

Human immunodeficiency virus primary infectionHuman immunodeficiency virus primary infection

Drug-induced hypersensitivity syndrome

Drug-induced hypersensitivity syndromeDrug-induced hypersensitivity syndrome

Mononucleosis

MononucleosisMononucleosis

Dengue fever

Dengue feverDengue fever

Chikungunya

Chikungunya

Serum sickness

Serum sicknessSerum sickness

Viral exanthem

Viral exanthemViral exanthem

Zika virus infection

Zika virus infectionZika virus infection

Rubella

RubellaRubella

Rocky Mountain spotted fever

Rocky Mountain spotted feverRocky Mountain spotted fever

Human Anaplasmataceae infection

Human Anaplasmataceae infectionHuman Anaplasmataceae infection

Secondary syphilis

Secondary syphilisSecondary syphilis

Stevens-Johnson syndrome

Stevens-Johnson syndromeStevens-Johnson syndrome

West Nile virus

West Nile virusWest Nile virus

Exanthematous drug eruption

Exanthematous drug eruptionExanthematous drug eruption

Epidemic typhus

Epidemic typhus

Marburg filoviridae virus infection

Marburg filoviridae virus infection

Measles

MeaslesMeasles

Enteroviral infection

Enteroviral infectionEnteroviral infection

Endemic typhus

Endemic typhus

Cat flea rickettsiosis

Cat flea rickettsiosis

Spirillum minus rat-bite fever

Spirillum minus rat-bite fever

Cryopyrin-associated periodic syndromes

Cryopyrin-associated periodic syndromes

Cat-scratch disease

Cat-scratch diseaseCat-scratch disease

Colorado tick fever

Colorado tick feverColorado tick fever

Adult-onset Still disease

Adult-onset Still diseaseAdult-onset Still disease

Bowel-associated dermatosis-arthritis syndrome

Bowel-associated dermatosis-arthritis syndromeBowel-associated dermatosis-arthritis syndrome

Atypical measles

Atypical measlesAtypical measles

Generalized essential telangiectasia

Generalized essential telangiectasiaGeneralized essential telangiectasia

Scrub typhus

Scrub typhusScrub typhus

Hand, foot, and mouth disease

Hand, foot, and mouth diseaseHand, foot, and mouth disease

Hemophagocytic lymphohistiocytosis

Hemophagocytic lymphohistiocytosisHemophagocytic lymphohistiocytosis

Sjögren syndrome

Sjögren syndromeSjögren syndrome

Pediculosis corporis

Pediculosis corporisPediculosis corporis

African trypanosomiasis

African trypanosomiasis

Southern tick-associated rash illness

Southern tick-associated rash illnessSouthern tick-associated rash illness

Streptobacillus moniliformis rat-bite fever

Streptobacillus moniliformis rat-bite feverStreptobacillus moniliformis rat-bite fever

African tick bite fever

African tick bite fever

Cercarial dermatitis

Cercarial dermatitisCercarial dermatitis

Cutaneous eruption of lymphocyte recovery

Cutaneous eruption of lymphocyte recovery

Kikuchi-Fujimoto disease

Kikuchi-Fujimoto diseaseKikuchi-Fujimoto disease

Leptospirosis

LeptospirosisLeptospirosis

Microvenular hemangioma

Microvenular hemangiomaMicrovenular hemangioma

Psittacosis

Psittacosis

Symmetric drug-related intertriginous and flexural exanthema

Symmetric drug-related intertriginous and flexural exanthema

Typhoid fever

Typhoid feverTyphoid fever

Trench fever

Trench fever

Schnitzler syndrome

Schnitzler syndrome

Sindbis

Sindbis

Tick-borne lymphadenopathy

Tick-borne lymphadenopathy

Vaccinia-induced erythema multiforme

Vaccinia-induced erythema multiformeVaccinia-induced erythema multiforme

Engraftment syndrome

Engraftment syndrome

Eosinophilia-myalgia syndrome

Eosinophilia-myalgia syndrome

Kawasaki disease

Kawasaki diseaseKawasaki disease

Trichinellosis

TrichinellosisTrichinellosis

Cutaneous collagenous vasculopathy

Cutaneous collagenous vasculopathy

TNF receptor-associated periodic syndrome

TNF receptor-associated periodic syndromeTNF receptor-associated periodic syndrome

Bourbon virus disease

Bourbon virus disease

Mediterranean spotted fever

Mediterranean spotted feverMediterranean spotted fever

Arcanobacterium haemolyticum pharyngitis

Arcanobacterium haemolyticum pharyngitis