摘要患者女，15岁，因四肢体位性红斑半年来就诊。皮肤科检查：站立并双上肢下垂30 s后，四肢呈现弥漫性网状红斑；双上肢上举或平躺30 s后，上、下肢红斑分别消退，恢复正常肤色。血压计试验阳性，抗核抗体1∶1000阳性，皮肤组织病理检查示真皮浅层小血管扩张，未见明显炎症细胞浸润。诊断重力性红斑。

abstractsA 15-year-old female patient presented with orthostatic erythema in the limbs for half a year. Skin examination revealed that diffuse reticular erythema appeared in the limbs after standing with her arms hanging down for 30 seconds, while the erythema disappeared and skin color returned to normal after raising her arms or lying flat for 30 seconds. The rash in the limbs was reproduced by inflating a sphygmomanometer cuff to 60 mmHg for 2 minutes with the limbs in the horizontal position. Antinuclear antibodies were positive at a titer of 1 ∶1 000. Histopathological examination showed dilated small vessels in the superficial dermis without obvious inflammatory cell infiltration. The patient was diagnosed with gravitational erythema.