noun
red spots; erythema
Medical term for reddened skin patches caused by capillary dilation; used in dermatology and general descriptions of skin symptoms.
紫外線を浴びすぎて、顔に紅斑が出た。
After too much sun exposure, red spots appeared on my face.
この薬の副作用として、皮膚に紅斑が生じることがあります。
As a side effect of this medicine, erythema may occur on the skin.