By comparison, secondary RP refers to the presence of the disorder in association with a related illness, such as systemic lupus erythematosus and scleroderma.

• 该现象临床上表现为指（趾）皮肤明显的颜色改变。本病的基础是因正常血管反应的局部缺陷而导致的指（趾）动脉和皮肤小动脉的异常血管收缩。