丘疹
局灶性皮肤内物质增加，可以摸到，边界清晰而表面通常光滑
颜色：炎症引起的呈红色；继发于其他沉积时可为红色、棕色或黄色
大小：＜ 5 mm
可以发生于全身，如斑疹-丘疹性疹病
丘疹可以融合形成斑块
丘疹可以增大变为结节
可以发鳞屑、痂皮或糜烂
可以与斑疹（斑疹-丘疹）、水疱（丘疹-水疱）或脓疱（丘疹-脓疱）并存
与结节的不同是结节 ＞ 10 mm
炎症性丘疹通常瘙痒
药疹、扁平苔藓、疥疮疹、结节性疥疮
肿瘤如早期结节型基底细胞癌
炎症浸润、脂类沉积、细胞增生
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