Kirsner, Robert S.

Lattouf, Carol

Elsevier - Publisher Connector 

© 2014 The Society for Investigative Dermatology www.jidonline.org 1
JID VisualDx Quiz
QUESTIONS
1. What is your diagnosis?
 a. Majocchi’s granuloma.
 b. Pseudofolliculitis barbae.
 c. Tinea barbae.
 d. Acne.
 e. Sarcoidosis.
JID VisualDx Quiz: September 2014
Carol Lattouf1 and Robert S. Kirsner1
Journal of Investigative Dermatology (2014) 134, e20. doi:10.1038/jid.2014.278
1Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, Florida, USA
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JID and Logical Images, Inc., have cooperated to offer the JID VisualDx Quiz, 
incorporating diagnostic images from VisualDx’s vast database. Questions relate to 
the image as well as to selected articles in JID, which are listed after the questions. 
Answers will be posted as supplementary material. We hope you enjoy this challenge.
JID VisualDx Quiz
2 Journal of Investigative Dermatology (2014), Volume 134 
2. Which of the following is true about highly pigmented versus lightly pigmented skin?
 a. It is more acidic than nonpigmented skin.
 b. It has superior barrier function compared with nonpigmented skin.
 c. It is better protected against folic acid degradation than nonpigmented skin.
 d. It recovers faster after tape stripping than nonpigmented skin.
 e. All of the above.
3.  Which enzyme is critical for barrier maintenance in highly pigmented skin compared with 
lightly pigmented skin?
 a. Transglutaminase.
 b. Phospholipase A2f.
 c. α-Galactosidase A.
 d. Uroporphyrinogen decarboxylase.
 e. Cathepsin D.
TOPIC ARTICLE
Questions 2 and 3 refer to the following article:
Man M-Q, Lin T-K, Santiago JL et al. (2014) Basis for enhanced barrier function of pigmented skin. J Invest Dermatol 134:2399–407
Answers are available as supplementary material at http://dx.doi.org/10.1038/jid.2014.278
Additional images related to this condition and the differential diagnosis may be found at http://info.
visualdx.com/l/11412/2014-07-08/w7pfc


JID VisualDx Quiz: September 2014 

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JID VisualDx Quiz: September 2014

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