Postauricular Incision Keloid: An Unintended Consequence of COVID-19 Mask Precautions

Introduction: Keloids of the head and neck can result in significant disfigurement and psychological stress. Here we report a novel case of keloid formation at a well-healed postauricular incision presenting after a year of daily ear loop mask use and discuss unique considerations for management. Method(s): This is a retrospective case review of a 35-year-old African American man with Klinefelter syndrome, type 2 diabetes mellitus, and a history of hypertrophic scar formation who presented to otology clinic in 2015 with chronic left otitis media and cholesteatoma. He underwent left tympanoplasty and mastoidectomy in 2016 through a postauricular incision 1 cm posterior to retroauricular sulcus in a standard fashion. In 2018, the patient was noted to have a hypertrophic scar without extension beyond the borders of the incision that was stable until 2021. Result(s): In 2021, the patient was noted to develop a 12A 7-cm postauricular keloid in the setting of mechanical irritation from his mask worn throughout the COVID-19 pandemic. Given the disfiguring cosmesis and resulting challenges securing an ear loop mask, he elected to undergo complete excision of the postauricular keloid with tension-free primary closure of the wound, intralesional corticosteroid injection (triamcinolone acetonide 40 mg/mL), and pressure dressing. The patient was counseled on options for mask wearing to avoid contact with the postauricular incision. Conclusion(s): When designing postauricular incisions in patients prone to hypertrophic scar or keloid formation, the point of postauricular contact of ear loop masks is a novel consideration to minimize risk of future pressure-related injury. Counseling on alternative face masks that tie behind the head or anchoring ear loops to buttons sewn onto a hat or headband are other preventative pressures.

Aesthetic Reconstruction of Auricular Keloids with a Novel Hemi-keystone Flap.

Surgical management of helical and retroauricular keloids has been rarely discussed. This study aims to introduce our successful reconstruction of helical and retroauricular keloids using a novel hemi-keystone flap. The current study is a retrospective review of patients with pathologically confirmed helical and retroauricular keloids. All keloid cases were completely excised. We covered the defect with a hemi-keystone flap followed by a single fraction of 10 Gy radiation therapy at postoperative day 0 or postoperative pressure therapy using magnets for four months. Treatment outcome was recorded as recurrence or nonrecurrence. A follow-up period of a minimum of 12 months was required in all patients. Of 45 keloids in 33 patients, none of the cases had a recurrence of their auricular keloids and the postoperative course was uneventful. We successfully reconstructed helical and retroauricular keloids using our modified hemi-keystone flaps without any keloid recurrence in one-year follow-ups. This is especially useful during the COVID-19 pandemic when facial mask wearing is mandatory. LEVEL OF EVIDENCE IV: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

The renin-angiotensin system in cutaneous hypertrophic scar and keloid formation.

Hypertrophic scar and keloid are two types of fibroproliferative conditions that result from excessive extracellular matrix production. The underlying pathological mechanism is not entirely clear. Activation of the renin-angiotensin system (RAS) is associated with fibrosis in various organs. RAS components including angiotensin II (Ang II), angiotensin AT1 and AT2 receptors, and angiotensin-converting enzyme (ACE) are expressed in the skin and act independently from the plasma RAS. AT1 receptors, which are usually the dominating receptor subtype, promote fibrosis and scar formation, while AT2 receptors inhibit the aforementioned AT1 receptor-coupled effects. Elevated angiotensin II (Ang II) levels acting on the AT1 receptor contribute to skin scar formation through increased expression of inflammatory factors such as interleukin-6 (IL-6), angiogenic factors such as vascular endothelial growth factor (VEGF) and fibrinogenic factors such as transforming growth factor-ß1 (TGF-ß1) and connective tissue growth factor (CTGF), while at the same time suppressing the anti-fibrotic tissue inhibitors of matrix metalloproteinase (TIMPs). First, small clinical trials have provided evidence that inhibition of the ACE/Ang II/ AT1 receptor axis may be effective in the treatment of hypertrophic scars/keloids. This review provides a detailed overview of the current literature on the RAS in skin, wound healing and scar formation and discusses the translational potential of targeting this hormonal system for treatment and prevention of hypertrophic scars and keloids.