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Rash begins at head and moves down; postauricular lmphadenopathy. pda

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Rubella Virus (german measles)

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Rash begins at head and moves down. Rash is preceded by cough, coryza, conjunctivitis, and blue-white spots on the buccal mucosa, blue centers on errythemous rash, he pathognomonic sign is the bright red and centrally white lesions on the buccal mucosa, which are called Koplik spots. Koplik spots are typically associated with the prodrome that precedes the development of the rash. The typical rash then begins below the ears and then spreads to include the trunk and extremities worsens to panencepholitis

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Measles virus (Rubeola, measles)

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parotitis, meningitis, orchitis or oophoritis in young adult. No rash

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Mumps virus

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Rash begins on trunk and spreads to face and extremities with lesions of different age

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VZV/chicken pox

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Macular rash over the body that appears after several days of high fever. Usually in infants,

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Roseola/HHV-6

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Rash on face that later appears over the body with a \"lace-like\" pattern

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Erythema infectiosum/parvovirus B19

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Erythematous, sandpaper-like rash with fever and sore throat, starts from trunk n spreads

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Streptococcus Pyogenes/Scarlet fever

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Vesicular rash on palms and soles; ulcers in oral mucosa, grey white herpatiform

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hand-foot-mouth disease/ coxsackie virus type A

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annular circle lesions postiove koh stain with erythemus lesion and scaly border fungal infection txt with azoles, microspuingin or tricphyton purtic

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tinea corpus

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ai disorder with silver white plauqes called auspitz sign when scraped off

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annular psoriasis

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yellow crusty lesions, umbilicated from strep pyogenous or s aures differentiate with a catalse test

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impetigo

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no annular rings, hot weather n tanning, less puritic, furfur, s&meatballs histology

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tinea versicolor

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sunburn rash in trunk scaly palms, hypotension, red tongue ( straw tongue think scarlet fever, kawasaki and tsst-1) bright papilla and increased pulse hypotension-s aures or pyo

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toxic shock syndrome type 1

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rose spots on abdomen, fever, headache, diarrhea

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thyphoid fever from salmonella thypi

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bulls eye rash then bells plasy, cardiac manifestations, neurological symptoms and rhuemtoid arthritis like doxy n ceft from burgdof , can also seen with ercgilosis, erythmea migrans

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lyme dz

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palms soles and ankles spread centripdially, blanching maculopapular lesions and progresses to petechial or purpuric txt doxy, twrds trunk, obligate intracellular

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rocky mountain spotted fever think cars ( coz a, rocks,2 syphillis)

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herald pathc aka christmkas tree aka on back and folds and salmon crusted spots in spring n fall

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Pityriasis rosea hhv7/6

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Sarcoptes scabei, is transmitted by direct contact with another person who is infested with the mites. The disease is most common in crowded conditions, such as dormitories, army barracks, day care, etc. Typically, patients will present with severe pruritus, often of the hands, feet, axillae, or groin. In particular, scabies will initially affect the webs of the fingers

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scabies

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USMLE step 1 Rash dx

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