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Translate this page into:

Image Correspondence
2 (
1
); 50-51
doi:
10.25259/IJPGD_83_2023

Bedside Dermoscopy and Demonstration of Tin-tack Sign in Discoid Lupus Erythematosus

Department of Dermatology, Command Hospital Air Force, Bengaluru, Karnataka, India
Corresponding author: Debdeep Mitra, Department of Dermatology, Command Hospital Air Force, Bengaluru, Karnataka, India. debdeep5000@gmail.com
Licence
This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-Share Alike 4.0 License, which allows others to remix, transform, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms.

How to cite this article: Mitra D, Bhatnagar A, Sanoj PK, Singh A. Bedside Dermoscopy and Demonstration of Tin-tack Sign in Discoid Lupus Erythematosus. Indian J Postgrad Dermatol. 2024;2:50-1. doi: 10.25259/IJPGD_83_2023

Discoid lupus erythematosus (DLE) has characteristic features on dermoscopy and examination of the scales reveal a tin-tack sign due to follicular plugging. Tin-tack sign occurs as a result of the deposition of scales in the hair follicles leading to cicatricial alopecia. Later, when scales are removed, characteristic keratotic spikes that provide the ‘carpet-tack or tin-tack sign’ become visible.

On removing the adherent scales of the DLE lesions, the horny plugs that have occupied the patulous hair follicles become evident and this is known as tin-tack sign, carpet-tack sign or cat tongue sign. One characteristic of DLE that has been well portrayed is a positive ‘tin-tack’ sign.

Dermoscopy (polarised ×10) showed branching and linear vessels and keratin plug, structureless white and brown areas in the background of scarring alopecia [Figure 1].

Figure 1:
(a) Dermoscopy (polarised ×10) showed branching and linear vessels and keratin plug, structureless white and brown areas in the background of scarring alopecia. (b) Discoid lupus erythematosus of scalp characterised by persistent scaly plaques, with associated scarring, atrophy and dyspigmentation. (c) Closer view of the scale showing tin-tack sign.

Ethical approval

Institutional Review Board approval is not required.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent.

Conflicts of interest

There are no conflicts of interest.

Use of artificial intelligence (AI)-assisted technology for manuscript preparation

The authors confirm that there was no use of artificial intelligence (AI)-assisted technology for assisting in the writing or editing of the manuscript and no images were manipulated using AI.

Financial support and sponsorship

Nil.


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