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In this section we have spot diagnoses posted on a daily basis since June 2010, now over 1700! You can review the archived cases and read the suggested diagnoses by users and the final comment by Dr Uma Sundram, the Editor-in-Chief and main spot diagnosis host. Case are uploaded each week day by 10 a.m. UK time with the correct diagnosis will generally be posted at 8 p.m. UK time. Why not view the most recent spot diagnosis and proffer a diagnosis?

Case Number : Case 3044 - 08 March 2022 Posted By: Uma Sundram

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
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25 year old female with pigmented lesion on right third toe for about 3 years.


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IgorSC

Posted

I think immunostais would be of great value to differentiate beteewn histiocytes and melanocytes. My opinion is that these cells are exogenous-pigmented laden macrophages probably filled with carbon-derived pigment (maybe asphalt or other trauma related pigment).

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Richard Logan

Posted

Yes, tattoo - either traumatic or "cosmetic"

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vincenzo

Posted

Tattoo-like exogenous pigment. 

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Anil Patki

Posted

Graphite tattoo because of injury by a sharp pencil tip ?

 

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Uma Sundram

Posted

Tattoo like pigment. The case is curious, as the patient has no history of tattoo here or nearby, and no known history of trauma. However, the findings are fairly diagnostic.

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