原位滤泡性 B 细胞肿瘤 (ISFN) 是滤泡性淋巴瘤的一种变体，表现为淋巴结活检或切除标本中的偶然组织学发现。 ISFN 呈现出在淋巴结或结外部位的生发中心内强烈表达 BCL2 和 CD10 的 B 细胞群。遗传分析显示 t(14;18) 易位。在此，我们报道了一名年轻女性的 ISFN 病例，其表现为军事性和粘连性面部丘疹，在产后自然消退。据我们所知，这是该罕见实体参与皮肤部位的唯一报告。版权所有 © 2023 Wolters Kluwer Health, Inc. 保留所有权利。

In situ follicular B-cell neoplasm (ISFN) is a variant of follicular lymphoma, presenting as an incidental histologic finding in lymph node biopsy or excisional specimens. ISFN presents with a B-cell population that strongly expresses BCL2 and CD10 within the germinal centers of a lymph node or extranodal site. Genetic analysis shows t(14;18) translocation. Herein, we report a case of ISFN presenting as military and agminated facial papules in a young woman, which resolved spontaneously in the postpartum period. To our knowledge, this is the only report of a cutaneous site of involvement of this rare entity.Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.