Indian Dermatology Online Journal

: 2020  |  Volume : 11  |  Issue : 2  |  Page : 294--295

Extensive becker's melanosis in a checkerboard mosaic pattern

Rini Makhija, Lalit K Gupta, Ashok K Khare, Asit Mittal 
 Department of Dermatology, Venereology and Leprology, R.N.T. Medical College, Udaipur, Rajasthan, India

Correspondence Address:
Lalit K Gupta
Department of Dermatology, Venereology and Leprology, R.N.T. Medical College, Udaipur - 313 001, Rajasthan

How to cite this article:
Makhija R, Gupta LK, Khare AK, Mittal A. Extensive becker's melanosis in a checkerboard mosaic pattern.Indian Dermatol Online J 2020;11:294-295

How to cite this URL:
Makhija R, Gupta LK, Khare AK, Mittal A. Extensive becker's melanosis in a checkerboard mosaic pattern. Indian Dermatol Online J [serial online] 2020 [cited 2021 Sep 16 ];11:294-295
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Full Text

An 18-year-old, healthy male presented with multiple well-defined asymptomatic hyperpigmented patches with irregular margins and satellite macules symmetrically affecting both upper extremities and trunk. Lesions were present since birth but started increasing in extent and degree of pigmentation for past 2 years. Lesions were confluent over bilateral upper extremities and shoulders, separated in midline covering both scapulae over back [Figure 1] and in a checker board like pattern over chest [Figure 2]. Hypertrichosis was present over lesions on the chest. No musculoskeletal abnormalities were detected on physical and radiological examination. The patient was in good general health. Hair, nail, and mucosae were normal. None of the family members had similar lesions. Histopathological examination revealed moderate acanthosis and increased basal cell layer pigmentation consistent with a diagnosis of Becker's melanosis [Figure 3]. Becker's melanosis is an uncommon cutaneous hamartomatous mosaic condition, characterized by unilateral, hyperpigmented, and hypertrichotic patch that commonly affects the upper trunk. In the majority of cases, it appears around puberty but very rarely may present since birth.[1] Multiple and giant lesions in a bilaterally symmetric distribution are extremely rare and usually present as Becker's nevus syndrome.[2],[3] Our patient had multiple and atypically large bilaterally symmetrical lesions exhibiting checkerboard pattern of mosaicism since birth, an extremely rare presentation of Becker's melanosis.{Figure 1}{Figure 2}{Figure 3}

The exact reason for the exhibition of checkerboard pattern in our case is not definitely clear, but has been reported in past in Becker's nevus[4] as well as systematized speckled lentiginous nevus and probably represents one of the several configurations of cutaneous mosaicism like narrow band and broad band Blaschko's lines, phylloid pattern, and patchy pattern without midline separation.[5] The pattern is most appreciable on trunk and difficult to appreciate on limbs probably due to anatomical differences.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

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Conflicts of interest

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