Six Cases of Amelanotic Melanoma: Focused on the Difficulty of Early Differential Diagnosis / 대한피부과학회지

Amelanotic melanoma comprises only 1.8~8.1% of malignant melanomas, and is difficult to diagnose clinically due to the lack of the diagnostic evidence of clinical pigmentation. To our knowledge, it is rarely reported, and only 10 cases have been reported in the Korean dermatological literature. It presents rather conflicting features such as a pink or red macule, papule, plaque, or nodule mimicking various benign and malignant conditions; therefore, it is difficult to diagnose. We performed a review of six patients with amelanotic melanoma focusing on differential diagnosis, particularly at the time of the initial visit. Clinical impressions included pyogenic granuloma, dermatofibrosarcoma protuberans, eccrine poroma, epidermal cyst, keloid, pilomatricoma, and squamous cell carcinoma in addition to malignant melanoma. The biopsy specimens were consistent with malignant melanoma with little or no melanin pigment on hematoxylin and eosin and Fontana-Masson stains. Four of the six patients were positive for S-100 and HMB-45, but two patients were positive for S-100 only. We report these cases to remind clinicians of the necessity of including malignant melanoma in the differential diagnosis process when patients show poor and unpredictable responses to treatment after a clinical diagnosis of other benign and malignant conditions.

Efficacy of Red or Infrared Light-Emitting Diodes in a Mouse Model of Propionibacterium acnes-Induced Inflammation

BACKGROUND: Laser/light-based devices may provide an alternative to conventional acne therapeutics in some patients with nonresponsive acne. OBJECTIVE: We investigated the efficacy of red or infrared light-emitting diode (LED) devices in a mouse model of Propionibacterium acnes-induced inflammation through clinical examination and histopathological and immunohistochemical studies. METHODS: A human-derived Propionibacterium acnes suspension (10(9) colony-forming units /µl) was injected into the back of an HR-1 mouse. Then, a 28.9 J/cm2 650-nm red LED or 9.3 J/cm2 830-nm infrared LED was applied to the mouse with P. acnes-induced inflammation once daily for 2 weeks. Two weeks after treatment, histological findings with hematoxylin and eosin staining and expression levels of inflammatory biomarkers (integrin α6, neutrophils, interleukin [IL]-1β, and matrix metalloproteinase [MMP]-2/9) were evaluated in tissue specimens using immunohistochemical staining. RESULTS: Mice treated with red and infrared LED showed clinical improvement in inflammatory nodules compared to mice in the control group. Red LED was much more effective than infrared LED. Epidermal hyperplasia, comedone-like cysts, and integrin α6 expression improved to a similar extent in the red and infrared LED treatment groups and control group. Neutrophil, IL-1β, MMP-2, and MMP-9 expression after treatment with red and infrared LED decreased considerably compared to expression in the control group. CONCLUSION: In a mouse model of P. acnes-induced inflammatory nodules, red and infrared LED devices may be an alternative to conventional acne therapies. In addition, a mouse model of P. acnes-induced inflammatory nodules is helpful for laboratory research of acne.

The Epidemiology of Dermatophyte Infection in Southeastern Korea (1979~2013)

No abstract available.

A Case of the Migration of Hyaluronic Acid Filler from Nose to Forehead Occurring as Two Sequential Soft Lumps

No abstract available.

A Case of the Migration of Hyaluronic Acid Filler from Nose to Forehead Occurring as Two Sequential Soft Lumps

No abstract available.

Six Cases of Segmental Neurofibromatosis / 대한피부과학회지

No abstract available.

A Comparative Study of Oral Cyclosporine and Betamethasone Minipulse Therapy in the Treatment of Alopecia Areata

BACKGROUND: Various systemic agents have been assessed for the treatment of alopecia areata (AA); however, there is a paucity of comparative studies. OBJECTIVE: To assess and compare cyclosporine and betamethasone minipulse therapy as treatments for AA with regard to effectiveness and safety. METHODS: Data were collected from 88 patients who received at least 3 months of oral cyclosporine (n=51) or betamethasone minipulse therapy (n=37) for AA. Patients with ≥50% of terminal hair regrowth in the alopecic area were considered responders. RESULTS: The responder of the cyclosporine group was 54.9% and that of the betamethasone minipulse group was 37.8%. In the cyclosporine group, patients with mild AA were found to respond better to the treatment. Based on the patient self-assessments, 70.6% of patients in the cyclosporine group and 43.2% of patients in the betamethasone minipulse group rated their hair regrowth as excellent or good. Side effects were less frequent in the cyclosporine group. CONCLUSION: Oral cyclosporine appeared to be superior to betamethasone minipulse therapy in terms of treatment effectiveness and safety.

A Case of Phaeohyphomycosis Caused by Exophiala lecanii-corni

No abstract available.

Effects of Magnesium Ascorbyl Phosphate on the Expression of Inflammatory Biomarkers after Treatment of Cultured Sebocytes with Propionibacterium acnes or Ultraviolet B Radiation

No abstract available.

Diagnosis of Cutaneous Nocardiosis with Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS) / 대한의진균학회지

Nocardiosis is a rare but potentially life-threatening infectious disease caused by several species of the genus Nocardia (N.), which are aerobic, filamentous, gram-positive bacilli. A definitive diagnosis depends on the isolation and identification of Nocardia species. But identification from clinical specimens may involve performing invasive techniques on the patient and lengthy process (take up to 1 or 3 weeks) owing to slow growth, and require a professional microbiologist. Currently the genus Nocardia is best identified using 16S rRNA and 18S rRNA gene sequence analysis. Recently matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) has launched a new era in the routine microbiology laboratory. This method has proved its efficacy for the identification and diagnosis of microorganism. MALDI-TOF MS has potential for use as a rapid (within 1 hour) and dependable method for the identification of Nocardia species with reproducibility and cost effectiveness. We report a 76-year-old woman who suffered from ulcer with papules on her right wrist and forearm. A biopsy of the skin showed granulomatous inflammation with central suppuration. A bacterial isolate from the skin was identified to be N. brasiliensis on comparative 16S rRNA gene sequencing and MALDI-TOF MS. To the best of our knowledge, this is the first case of nocardiosis in Korea caused by N. brasiliensis identified on MALDI-TOF MS.

A Case of Cutaneous Protothecosis / 대한의진균학회지

Protothecosis is a rare skin infection caused by pathogenic algae of the genus Prototheca, especially Prototheca wickerhamii. It is widely distributed throughout the natural world in tree, river, lake, sewage, soil, marsh, household waste, etc. A 79-year-old woman presented with ill-defined edematous and erythematous patches with various sized and shaped deep ulcers on both dorsal hands and left distal forearm for 1 month. The left forearm was initially injured by scratching due to pruritus and insidiously aggravated. Biopsy specimen revealed the characteristic morula-like sporangias containing multiple endospores in the dermis. The GMS and D-PAS stains highlighted the characteristic spores showing multiple internal septations and some unicellular endospore. P. wickerhamii was isolated in culture and identified by biochemical studies. Oral itraconazole 200 mg/day administration for 7 weeks resulted in marked improvement of the skin lesion.

HR-1 Mice: A New Inflammatory Acne Mouse Model

BACKGROUND: There is no appropriate in vivo animal model that reflects the inflammatory response of human acne. OBJECTIVE: This study investigated the effect of Propionibacterium acnes on the development of inflammatory acne-like lesions in four mouse strains with different degrees of immune response for the development of an optimal mouse model of inflammatory acne. METHODS: Human P. acnes suspensions (10(8) and 10(9) colony forming unit [CFU]/microl) were injected into the backs of HR-1, BALB/c, vitamin D receptor-knockout (VDR k/o), and severe combined immunodeficiency disease mice. Inflammation levels were evaluated two weeks after injection of P. acnes suspensions. In addition, histopathological examination and immunohistochemical staining of the expressions of inflammatory biomarkers (i.e., CD4+/CD8+ T lymphocytes, neutrophils, myeloperoxidase, interleukin-1beta, matrix metalloprotease (MMP)-2, MMP-3, MMP-9, toll-like receptor (TLR)-2, LL-37, and integrin alpha6) were performed on tissue specimens. RESULTS: The HR-1 mouse strain exhibited the most remarkable inflammatory reaction with epithelial proliferation and microcomedone-like cyst formation. HR-1 mice also demonstrated aberrant integrin expression in the epidermis around both inflamed lesions and newly formed microcomedones. These findings were more prominent in the group receiving 10(9) CFU/microl P. acnes than 10(8) CFU/microl. MMP-9 expression in HR-1 mice was also upregulated around the microcomedone-like cysts. Finally, expression levels of TLR-2 and LL-37 were higher in HR-1 and BALB/c mice than the VDR k/o and SCID mice strains. CONCLUSION: P. acnes induces acneiform inflammation with small microcomedones in HR-1 mice. Therefore, the HR-1 mouse strain represents a good candidate for the development of a new inflammatory acne mouse model.