Triangular alopecia

<h2 id="presentation">Presentation</h2>
<h3>Association with Other Conditions</h3>
<p>TTA has been associated with several disorders, such as <a href="/facts/Phakomatosis_pigmentovascularis/kLWX3f5w">Phakomatosis pigmentovascularis</a>. And a rare syndrome <a href="/facts/Setleis_syndrome/yVLAcHba">Setleis syndrome</a>. It is inherited by the autosomal dominant trait and is characterized by <a href="/facts/Cutis_aplasia/yAgQ8vWB">cutis aplasia</a> or atrophic skin at the temples, which is said to resemble forceps marks. There may also be a coarse facial appearance, anomalies of the eyelashes and eyebrows, and periorbital puffiness.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a>
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<h2 id="frequency">Frequency</h2>
<p>The suggested frequency for this condition in the general population is around 0.11%. The hair loss is non-progressive and does not expand beyond these areas. It is a non-inflammatory, non-scarring form of hair loss easily confused with <a href="/facts/Alopecia_areata/UeYKJwsz">alopecia areata</a>. In one report, the condition was incorrectly believed by the parents to be induced by doctors inserting <a href="/facts/Intravenous/AwwuD3Nu">intravenous</a> cannulas into scalp vessels during the neonatal period. The condition is permanent and the affected skin does not change later in life.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a>
</p><p>Of the 53 reported cases of TTA, more than half (55.8%) were detected in childhood between the ages of 2 and 9 years, while 36.5% were detected at birth and only 3.8% (only two cases) in adulthood.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a>
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<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Alopecia/uEPKUafl">Alopecia</a></li>
<li><a href="/facts/Skin_lesion/Vkr5XpeG">Skin lesion</a></li>
<li><a href="/facts/List_of_cutaneous_conditions/U58kszg2">List of cutaneous conditions</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Freedberg, et al. (2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0. <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"Hair and Nail Disorders of Childhood". Archived from the original on 2017-09-18. Retrieved 2012-03-25. <a href="https://web.archive.org/web/20170918054310/http://www.medscape.com/viewarticle/585158_5" target="_blank">https://web.archive.org/web/20170918054310/http://www.medscape.com/viewarticle/585158_5</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>"Other alopecias - congenital triangular alopecia". <a href="http://www.keratin.com/af/af005.shtml" target="_blank">http://www.keratin.com/af/af005.shtml</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>26955-temporal-triangular-alopecia-and-a-review-of-52-past-cases <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
</ol>

Triangular alopecia open-in-new

Triangular alopecia