Purpura - 紫癜
应排除涉及血管炎的其他全身性疾病（自身免疫性疾病）。
Purpura annularis telangiectodes
References
Actinic purpura 当血液渗入皮肤真皮层时就会发生这种情况。发生这种情况是因为皮肤变薄，血管变得脆弱，尤其是经常暴露在阳光下的老年人。
Actinic purpura results from the extravasation of blood into the dermis. This phenomenon is due to the skin atrophy and fragility of the blood vessels in elderly individuals, which is exacerbated by chronic sun exposure.
Actinic purpura results from the extravasation of blood into the dermis. This phenomenon is due to the skin atrophy and fragility of the blood vessels in elderly individuals, which is exacerbated by chronic sun exposure.
○ 治疗
大多数紫癜在 7 天左右就会消失。如果紫癜无明显原因复发，人们应该去看医生并进行血液检查以检查凝血障碍。