Schneiderman Prelims Vol-I. qxd

INFECTIONS AND INFESTATIONS
Anthrax – eschar
Aspergillosis – primary cutaneous – blisters with central black
dots
JAAD 31:344–347, 1994; black eschar AD 141:633–638,
2005
Bed bugs (
Cimex lectularis) Ped Derm 22:183–187, 2005
Black blowfly (maggot, genus 
Phormia) 
Black death (plague, 
Yersinia pestis) and kala-azar
Black dot ringworm
Blackflies
Black piedra
Black widow spider bite
Condyloma acuminata 
Tyring p.263, 2002
Fungal melanonychia (onychomycosis) 
JAAD 31:311–316,
1994
Acrotherium nigrum
Alternaria grisea tenuis
Alternaria numiocola
Blastomyces
Candida
Chaetomium kunze
Fusarium oxysporum
Homodendrum elatum
Phyllostictina sydow
Scytalidium dimidiatum – superficial black onychomycosis
AD 140:696–701, 2004
Trichophyton rubrum
Trichophyton sudanense
Wangiella dermatiditis
Insect bite reaction – blister with central black dot
Lyme disease – blister with central black dot; necrotic bulla
Molluscum contagiosum – involuting
Mycetoma – black grains 
Caputo p.153, 2000
Myiasis due to
Cordylobia anthropophaga JAAD 126:199–202,
1990
Necrotizing fasciitis – periorbital blue–black necrosis
AD 140:664–666, 2004
74
A CLINICIAN
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S GUIDE TO DERMATOLOGIC DIFFERENTIAL DIAGNOSIS, VOLUME 1
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Onychomycosis – black nail 
Ghatan p.77, 2002, Second Edition
Osteomyelitis – subungual black macules associated with
osteomyelitis of distal phalanges 
AD 124:418–423, 1988
Pinta – black nails
Pitted keratolysis
Pseudochromhidrosis – colorless sweat becomes pigmented
due to chromogenic bacteria (
Corynebacterium) Rook p.2001,
1998, Sixth Edition
Rickettsial pox – eschar (tache noir) 
JAAD 2:359–373, 1980
Scrub typhus (
Rickettsia tsutsugamuchi ) (mites) – headache
and conjunctivitis; eschar with black crust; generalized macular
or morbilliform rash 
JAAD 2:359–373, 1980
Tick, engorged or non-engorged 
Rook p.1456, 1998, Sixth
Edition; Br Med J 309:1693, 1994
Tick typhus (Boutonneuse fever, Kenya tick typhus, African and
Indian tick typhus) (ixodid ticks) – small ulcer at site of tick bite
(tache noire) – black necrotic center with red halo; pink
morbilliform eruption of forearms, then generalizes, involving
face, palms, and soles; may be hemorrhagic; recovery
uneventful 
JAAD 2:359–373, 1980
Tinea capitis – endothrix (T. tonsurans and T. violaceum) – black
dots of swollen hair shafts as hairs break at surface of scalp
JAAD 8:322–330, 1983
Tinea nigra palmaris – 
Phaeoannelomyces werneckii Ped Derm
20:315–317, 2003; AD 11:904–905, 1975
Trichomycosis axillaris
Tungiasis with central black pit or dot 
AD 141:389–394, 2005;
JAAD 20:941–944, 1989; JAAD 15:117–119, 1986
Zygomycosis – black eschar; edema with black discoloration
J Pediatr Surg 37:1607–1611, 2002