Figure 2 - available via license: Creative Commons Attribution-NonCommercial 4.0 International
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(A) A medium-sized congenital melanocytic nevus surmounted by yellow crusts and fissures. (B) Dermoscopy showed scales, glomerular/dotted vessels, and short linear black fibers stuck to the eczematous surface. (C) Areas with a homogeneous pigmentation were observed on dermoscopy. (D) Histopathology showed the features of a normal congenital melanocytic nevus associated with a chronic dermatitis.
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Citations
... The underlying cause of MN has not been explained so far. Of note, Meyerson's phenomenon, apart from common acquired melanocytic nevi, has been described also in relation to dysplastic nevi, congenital melanocytic nevi, melanoma as well as other benign and malignant skin tumours [1][2][3][4][5][6]. There are few dermoscopic descriptions of melanocytic nevi with Meyerson's phenomenon, and to the authors' knowledge none of them concerned amelanotic MN [1][2][3][4]. ...
... Of note, Meyerson's phenomenon, apart from common acquired melanocytic nevi, has been described also in relation to dysplastic nevi, congenital melanocytic nevi, melanoma as well as other benign and malignant skin tumours [1][2][3][4][5][6]. There are few dermoscopic descriptions of melanocytic nevi with Meyerson's phenomenon, and to the authors' knowledge none of them concerned amelanotic MN [1][2][3][4]. It was previously stated that Meyerson's phenomenon does not modify the dermoscopic feature of the melanocytic lesion, but sometimes it may be difficult to assess due to the presence of overlying yellowish crust [1]. ...
... It was previously stated that Meyerson's phenomenon does not modify the dermoscopic feature of the melanocytic lesion, but sometimes it may be difficult to assess due to the presence of overlying yellowish crust [1]. On the other hand, Forum Dermatologicum B A a recent report by Di Altobrando et al. [2] describing clinical and dermoscopic features of two congenital melanocytic nevi with this phenomenon showing worrisome dermoscopic patterns raises a question of whether this statement is still actual. The lack of the classical erythematous halo and fast growth of the lesion reported by the patient with previous oncological history influenced the decision of prompt excision of the lesion in the described case. ...
... Meyerson nevus, also called "halo eczema nevus" or "halo dermatitis nevus", is an eczematous eruption around a pre-existing nevus [10]. The dermoscopic manifestations usually show yellowish scales/serocrust and local dotted vessels [11,12]. Dermoscopy is helpful in distinguishing the eczematous halo from the purpuric halo. ...
Background:
Targetoid haemosiderotic nevus (THN), a distinct clinical form of melanocytic nevus, is characterized by the sudden development of a purpuric halo surrounding a pre-existing nevus, easily mistaken for melanoma.
Objectives:
To summarise the clinical, dermoscopic and histopathological findings of THN in order to better recognize and manage this condition.
Materials & methods:
We describe four cases and provide a review of the literature based on a search in PubMed. Overall, the clinical, dermoscopic and pathological findings of 15 THN cases are summarised.
Results:
THN was characterized by a sudden onset of a purpuric halo surrounding a pre-existing nevus without any apparent trigger which occurred mainly in young females. Dermoscopically, the central nevus showed a black-brown, globular or homogeneous pattern, possibly interspersed with reddish, purple, or black structureless areas and comma-shaped vessels. The peripheric purpuric halo had two patterns: one with homogeneous reddish or purplish red areas, and another with an inner pale and outer homogeneous reddish or purplish red zone. The pathological findings showed an intradermal or compound nevus, dilated vessels, and extravasated erythrocytes, possibly accompanied by perivascular inflammatory infiltration and fibrin and hemosiderin deposits.
Conclusion:
THN is a benign lesion that usually requires no intervention other than follow-up observation. Dermoscopy is a useful non-invasive diagnostic tool, and biopsy can be avoided. The purpuric halo resolves spontaneously within two to four weeks with rare recurrence.
... Since then, this phenomenon has been known as "Meyerson Phenomenon" or "Halo-Eczema" and has been described in a variety of pigmented and non-pigmented lesions. Most of the cases reported in children have been associated with congenital and acquired melanocytic nevi [2][3][4][5]. In adult patients, this phenomenon has been also described in nevi and melanoma [6]. ...
Meyerson phenomenon, also known as “halo-eczema,” has been widely described over melanocytic and non-melanocytic lesions. However, its appearance over vascular anomalies is rarely observed and could lead to diagnostic errors. A case study of five patients aged between four months and two years is reported. These patients developed unique erythematous and pruritic scaly patches, being diagnosed and treated as fungal infections. Due to the lack of response to the treatment, they were referred to the pediatric dermatology practice, where the diagnosis of Meyerson phenomenon over capillary malformations was made. Topical treatment with corticosteroids led to improvement in all cases. Although Meyerson phenomenon developing over vascular anomalies is a rare condition, it is important for pediatricians and dermatologists to assess it as a part of the differential diagnosis when treating a patient with skin lesions. Recognizing this phenomenon will prevent diagnostic and therapeutic errors.
