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In this section we have spot diagnoses posted on a daily basis since June 2010, now over 4000! You can review the archived cases and read the suggested diagnoses by users and the final comment by the contributors.
Case are uploaded each week day by 10 am UK time with the correct diagnosis will generally be posted at 8 pm UK time. Why not view the most recent spot diagnosis and proffer a diagnosis?

Case Number : CASE 4437 - 23 January 2024 Posted By: Admin_Dermpath

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
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71-year-old white gentleman (Vietnam Veteran) with a history of 2 skin-colored plaques forming on his left forehead and behind ear. Clinical diagnosis was insect/arthropod bite reaction. The patient stated that he used to have similar lesions in the past, which appeared and disappeared spontaneously, but plaques in the left forehead and neck did not disappear.

Contributor: Dr. Phyu P. Aung
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Admin_Dermpath

Admin_Dermpath 1,217

Posted

Thank you for your comments. 

The final diagnosis is: Primary cutaneous CD4 positive small/medium sized T cell lymphoma.

The differential diagnoses to consider are:

a) Folliculotropic Mycoses Fungoides.
b) Primary cutaneous gamma-delta T cell lymphoma.
d) Dermal hypersensitivity reaction.
e) Ruptured folliculitis/follicular cyst.
 

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