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- Presentation
Dermoscopy of Facial Pigmented Lesions
Description
In this lecture, Amanda Levine discusses dermoscopy of facial pigmented lesions, emphasizing the unique characteristics and challenges encountered compared to body lesions. Unlike the typical pigment network found on the body, facial lesions often present a pseudo-network due to the flattening of the dermal-epidermal junction. Key diagnostic features include gray dots, asymmetric follicular openings, rhomboidal structures, and homogeneous areas, which can indicate lentigo maligna or other conditions. Levine highlights the difficulty in differentiating between conditions such as lentigo maligna and pigmented actinic keratosis, especially given that many lesions can share similar dermoscopic features. Importantly, she notes that gray dots, particularly when arranged around follicular openings, are significant markers for assessing potential malignancy. The presence of solitary macules—a lone lesion without similar surrounding spots—is also a concerning sign for melanoma. Significant attention is given to the homogeneous areas that can obliterate hair follicles, suggesting invasive melanomas. Overall, the lecture underscores the importance of careful dermoscopic examination for accurate diagnosis and the need for biopsies in uncertain cases.
View moreConclusions
- Dermoscopy of facial pigmented lesions has different diagnostic rules compared to lesions on the body.
- Melanocytic lesions on the face often present as a pseudo network due to the flattening of the dermal-epidermal junction.
- Flat pigmented lesions on the face can be difficult to differentiate, with options including nevi, lentigos, and actinic keratoses.
- The presence of gray dots in an annular granular pattern is indicative of lentigo maligna but can also appear in other conditions.
- Asymmetric follicular openings are a key feature for diagnosing lentigo maligna and can indicate more concerning lesions.
- Rhomboidal structures and homogeneous areas are significant dermoscopic features associated with lentigo maligna that may suggest invasive melanoma.
- A solitary brown macule—termed the 'Lone Ranger' sign—on the face raises concern for melanoma, especially if there are no similar surrounding lesions.
- Biopsies should be considered when there are suspicious features in facial pigmented lesions, particularly if gray coloration or focal pigmentation is observed.
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