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in particular the first and second fingers of the right hand &#40;<a class="elsevierStyleCrossRefs" href="#fig0005">Figs&#46; 1 and 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0015" class="elsevierStylePara elsevierViewall">Dermoscopy showed pigmentation with a ridge pattern and sparing of the acrosyringeal apertures&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Histopathology</span><p id="par0020" class="elsevierStylePara elsevierViewall">Histologic examination of a punch biopsy specimen showed no relevant findings in the dermis or epidermis&#44; or pigmented substances in the stratum corneum&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Additional Tests</span><p id="par0025" class="elsevierStylePara elsevierViewall">The mycobacterial culture was negative&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">What Is Your Diagnosis&#63;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Diagnosis</span><p id="par0035" class="elsevierStylePara elsevierViewall">Exogenous pigmentation induced by the handling of millipedes&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Clinical Course and Treatment</span><p id="par0040" class="elsevierStylePara elsevierViewall">The boy was shown some photographs of worms he might have been playing with in the school playground and clearly identified the Tanzanian red-legged millipede&#46; One week later the lesions showed clear clinical improvement without treatment&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Comment</span><p id="par0045" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Epibolus pulchripes</span>&#44; otherwise known as the Tanzanian red-legged millipede&#44; is a member of the Diplopoda class<span class="elsevierStyleItalic">&#46;</span> Although it inhabits tropical and subtropical areas of West Africa&#44; its presence in southern and eastern Spain could be related to migratory phenomena or accidental introduction with displacement of native millipede species&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">When the arthropod feels threatened&#44; it curls up and releases substances rich in cyanide and quinones through pores in its exoskeleton&#46; Contact with cyanide can cause inflammation&#44; itching&#44; or stinging&#44; as well as vesiculation or ulceration in the event of prolonged contact&#46; Quinone compounds secreted as chemical defense mechanisms cause hyperpigmentation of the skin and mucous membranes&#46;<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">1&#44;2</span></a> The pigmented spots on the palms of the boy in our case would have been caused by quinone secreted by the millipede when crushed&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Reports of similar cases to ours have described an asymptomatic reddish-brown or black spot in the contact area after accidental crushing of other species of millipedes and even spots reproducing the shape of the millipede&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">3</span></a> The most common locations affected are the toes and neck&#44; although the mouth may sometimes be involved&#46; Eye contact can cause conjunctivitis or corneal ulcers&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">Diagnosis is usually established clinically with a careful history&#46; Manifestations can sometimes mimic cutaneous manifestations of systemic diseases&#44; or even acute arterial occlusion&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">4&#44;5</span></a></p><p id="par0065" class="elsevierStylePara elsevierViewall">The ridge pattern on dermoscopy is common&#46; When observed&#44; acral melanoma&#44; which manifests as a brown-black spot&#44; must be ruled out&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">2</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">Other entities in the differential diagnosis include metabolic disorders&#44; infections such as <span class="elsevierStyleItalic">tinea nigra</span>&#44; exposure to other exogenous substances such as henna&#44; silver nitrate&#44; or potassium permanganate&#44; and contact with certain plants&#46; All these diagnoses were ruled out in our case by clinical history and complementary tests&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">Lesions heal spontaneously and do not require treatment&#44; although topical alcohols may be used&#46; Itching or irritation can be treated with topical corticosteroids&#46;<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">1&#44;2&#44;5</span></a></p></span></span>"
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Cases for Diagnosis
Red-Brown Patches on a Boy's Palms
Manchas de color marrón-rojizo en las palmas de un niño
A.A. González Ruiza,
Corresponding author
mjsanchezpujol@gmail.com

Corresponding author.
, A. Botía Pacoa, A. Docampo Simóna, M. Niveiro de Jaimeb, I. Betlloch-Masa
a Servicio de Dermatología, Hospital General Universitario de Alicante-ISABIAL, Alicante, Spain
b Servicio de Anatomía Patológica, Hospital General Universitario de Alicante-ISABIAL, Alicante, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Medical History</span><p id="par0005" class="elsevierStylePara elsevierViewall">A 7-year-old boy with no relevant past history was evaluated by the dermatologist at the emergency department of our hospital regarding the presence of several asymptomatic spots on his hands&#46; The lesions had appeared after the boy had been playing with worms in the school playground and were resistant to soap and water&#46; His mother said that some children who had been playing with him had similar spots&#44; although to a lesser extent&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Physical Examination</span><p id="par0010" class="elsevierStylePara elsevierViewall">Physical examination showed poorly defined reddish-brown macules on the boy&#39;s palms and on some fingers&#44; in particular the first and second fingers of the right hand &#40;<a class="elsevierStyleCrossRefs" href="#fig0005">Figs&#46; 1 and 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0015" class="elsevierStylePara elsevierViewall">Dermoscopy showed pigmentation with a ridge pattern and sparing of the acrosyringeal apertures&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Histopathology</span><p id="par0020" class="elsevierStylePara elsevierViewall">Histologic examination of a punch biopsy specimen showed no relevant findings in the dermis or epidermis&#44; or pigmented substances in the stratum corneum&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Additional Tests</span><p id="par0025" class="elsevierStylePara elsevierViewall">The mycobacterial culture was negative&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">What Is Your Diagnosis&#63;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Diagnosis</span><p id="par0035" class="elsevierStylePara elsevierViewall">Exogenous pigmentation induced by the handling of millipedes&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Clinical Course and Treatment</span><p id="par0040" class="elsevierStylePara elsevierViewall">The boy was shown some photographs of worms he might have been playing with in the school playground and clearly identified the Tanzanian red-legged millipede&#46; One week later the lesions showed clear clinical improvement without treatment&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Comment</span><p id="par0045" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Epibolus pulchripes</span>&#44; otherwise known as the Tanzanian red-legged millipede&#44; is a member of the Diplopoda class<span class="elsevierStyleItalic">&#46;</span> Although it inhabits tropical and subtropical areas of West Africa&#44; its presence in southern and eastern Spain could be related to migratory phenomena or accidental introduction with displacement of native millipede species&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">When the arthropod feels threatened&#44; it curls up and releases substances rich in cyanide and quinones through pores in its exoskeleton&#46; Contact with cyanide can cause inflammation&#44; itching&#44; or stinging&#44; as well as vesiculation or ulceration in the event of prolonged contact&#46; Quinone compounds secreted as chemical defense mechanisms cause hyperpigmentation of the skin and mucous membranes&#46;<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">1&#44;2</span></a> The pigmented spots on the palms of the boy in our case would have been caused by quinone secreted by the millipede when crushed&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Reports of similar cases to ours have described an asymptomatic reddish-brown or black spot in the contact area after accidental crushing of other species of millipedes and even spots reproducing the shape of the millipede&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">3</span></a> The most common locations affected are the toes and neck&#44; although the mouth may sometimes be involved&#46; Eye contact can cause conjunctivitis or corneal ulcers&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">Diagnosis is usually established clinically with a careful history&#46; Manifestations can sometimes mimic cutaneous manifestations of systemic diseases&#44; or even acute arterial occlusion&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">4&#44;5</span></a></p><p id="par0065" class="elsevierStylePara elsevierViewall">The ridge pattern on dermoscopy is common&#46; When observed&#44; acral melanoma&#44; which manifests as a brown-black spot&#44; must be ruled out&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">2</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">Other entities in the differential diagnosis include metabolic disorders&#44; infections such as <span class="elsevierStyleItalic">tinea nigra</span>&#44; exposure to other exogenous substances such as henna&#44; silver nitrate&#44; or potassium permanganate&#44; and contact with certain plants&#46; All these diagnoses were ruled out in our case by clinical history and complementary tests&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">Lesions heal spontaneously and do not require treatment&#44; although topical alcohols may be used&#46; Itching or irritation can be treated with topical corticosteroids&#46;<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">1&#44;2&#44;5</span></a></p></span></span>"
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