Dermato

Open AccessCase Report

Friction-Induced Biphasic Cutaneous Amyloidosis

Thilo Gambichler

Laura Susok

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Marc H. Segert

Dermato 2021, 1(1), 31-34; https://doi.org/10.3390/dermato1010005 - 19 Aug 2021

Abstract

Primary cutaneous amyloidoses (PCA) are a group of conditions characterized by deposition of amyloid in previously normal skin, without association with other skin or systemic diseases. We describe a Kazakhstani female with a 30-year history of increasingly spreading hyperpigmented macular as well papular skin lesions on her upper trunk accompanied by pruritus. Moreover, her medical history included intensely rubbing her skin with a cotton towel following bathing and showering. On the basis of the clinical and histopathological findings, the diagnosis of biphasic cutaneous amyloidosis was made. The present unusual case of biphasic cutaneous amyloidosis can be subsumed under mechanically-induced forms of cutaneous amyloidosis. In conclusion, the present case underscores the necessity to explore carefully the patient’s history in order to discover the cause of PCA. Full article

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Open AccessCase Report

A Case of Unilateral Hyperpigmentation

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Dermato 2021, 1(1), 26-30; https://doi.org/10.3390/dermato1010004 - 01 Jul 2021

Abstract

Phytophotodermatitis is a cutaneous phototoxic reaction resulting from contact with plant compounds such as furocoumarin in citrus fruits, followed by exposure to ultraviolet light. Erythema and vesicles appear on the contact area, followed by hyperpigmented lesions. Hyperpigmentation may exist for weeks to months before fading but can remain up to several years. Diagnosis is often challenging due to the variety of clinical presentations, and it is not always easy to identify trigger exposures. A detailed history is key to diagnosis. We herein report a case of lime-induced phytophotodermatitis which was initially mistaken for unilateral lentiginosis. The patient underwent Q-switched Nd:YAG laser and intense pulsed light (IPL) treatment with immediate improvement. Full article

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Open AccessArticle

Rare TERT Promoter Mutations Present in Benign and Malignant Cutaneous Vascular Tumors

Philipp Jansen

Georg Christian Lodde

Anne Zaremba

Carl Maximilian Thielmann

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Dermato 2021, 1(1), 18-25; https://doi.org/10.3390/dermato1010003 - 25 Jun 2021

Abstract

Mutations in the promoter of the telomerase reverse transcriptase (TERT) gene have been described as the most common hot-spot mutations in different solid tumors. High frequencies of TERT promoter mutations have been reported to occur in tumors arising in tissues with low rates of self-renewal. For cutaneous vascular tumors, the prevalence of TERT promoter mutations has not yet been investigated in larger mixed cohorts. With targeted next-generation sequencing (NGS), we screened for different known recurrent TERT promoter mutations in various cutaneous vascular proliferations. In our cohort of 104 representative cutaneous vascular proliferations, we identified 7 TERT promoter mutations. We could show that 4 of 64 (6.3%) hemangiomas and vascular malformations harbored TERT promoter mutations (1 Chr.5:1295228 C > T mutations, 1 Chr.5:1295228_9 CC > TT mutation, and 2 Chr.5:1295250 C > T mutations), 1 of 19 (5.3%) angiosarcomas harbored a Chr.5:1295250 C > T TERT promoter mutation, and 2 of 21 (9.5%) Kaposi’s sarcomas harbored TERT promoter mutations (2 Chr.5:1295250 C > T mutations). To our knowledge, this is the first general description of the distribution of TERT promoter mutations in a mixed cohort of cutaneous vascular tumors, revealing that TERT promoter mutations seem to occur with low prevalence in both benign and malignant cutaneous vascular proliferations. Full article

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Graphical abstract

Open AccessArticle

The Impact of Titanium Dioxide Type Combined with Coffee Oil Obtained from Coffee Industry Waste on Sunscreen Product Performance

Bruna G. Chiari-Andréo

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Dermato 2021, 1(1), 2-17; https://doi.org/10.3390/dermato1010002 - 21 Jun 2021

Abstract

(1) Background: Titanium dioxide (TiO₂) consists of three polymorphs, including anatase, rutile and brookite. This work aimed to elucidate the influence of rutile and anatase forms in the performance of sunscreens formulated with green coffee oil (GCO) from coffee beans discarded in the agri-food industry. (2) Methods: TiO₂ particles were characterized in terms of size and wettability. The sunscreens formulated with GCO were characterized regarding the droplet size, rheology, texture profile analysis (TPA), in vitro Sun Protection Factor and Water Resistance Retention. Topical delivery and permeation studies were performed to confirm caffeine release and skin penetration. (3) Results: Particle size distributions of rutile and anatase TiO₂ particles were similar, however, smaller droplets as well as decreased viscosity and increased thixotropy were obtained for anatase TiO₂ and GCO formulation compared to rutile form formulations. Notwithstanding, all formulations exhibited linear viscoelastic behavior. Regarding the TPA, a wide range of mechanical properties improved mainly by GCO rather than TiO₂ form has been demonstrated. The influence of TiO₂ form on UV protection was better evidenced in absence of GCO. The sunscreen formulations containing GCO presented a favorable topical delivery as confirmed by caffeine release and permeation. (4) Conclusions: Both TiO₂ forms combined with GCO provided suitable properties including an effective ultraviolet (UV)-light protection. Full article

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