Huiyi Yao,1 Wenzhong Xiang2 

1Department of Dermatology, Zhejiang Chinese Medical University, Hangzhou Third People’s Hospital, Hangzhou, People’s Republic of China; 2Department of Dermatology, Hangzhou Third People’s Hospital, Hangzhou Third People’s Hospital Affiliated to Zhejiang Chinese Medical University, Hangzhou, People’s Republic of China

Correspondence: Wenzhong Xiang, Department of Dermatology, Hangzhou Third People’s Hospital, Hangzhou Third People’s Hospital Affiliated to Zhejiang Chinese Medical University, Westlake Ave 38, Hangzhou, 310009, People’s Republic of China, Tel +86 13588004268, Email xiangwenzhong@126.com

Abstract: Becker’s nevus (BN) is a kind of epidermal cutaneous hamartoma. A noticeable hyperpigmented patch with a big, unilateral, hyperpigmented macule and irregularly shaped borders is the manner in which BN often presents. In this case, a 16-year-old boy has asymptomatic dark brown colored follicular macule on the left side of the cheek shortly after birth. The lesions were initially inconspicuous but gradually became darker as time passed. The macules on some of them grew hair. This case of BN with apparent hypertrichosis on one side of the cheek, which made it challenging to make a differential diagnosis with whiskers. The primary point of differentiation is that the lesions of BN only appear unilaterally. On the other hand, the face has whiskers on both sides. Additionally, BN will show hyperpigmentation whereas whiskers do not. In conclusion, for its unusual clinical presentation, we believe that reporting this case may help dermatologists avoid misdiagnosing similar cases.

Keywords: Becker’s nevus, misdiagnosed, whiskers, hypertrichosis