Purpura - 紫癜
應排除其他涉及血管炎的全身性疾病（自體免疫疾病）。
Purpura annularis telangiectodes
References
Actinic purpura 當血液滲入皮膚真皮層時就會發生這種情況。發生這種情況是因為皮膚變薄，血管變得脆弱，尤其是經常暴露在陽光下的老年人。
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.
○ 治療
大多數紫斑會在 7 天左右消失。如果紫斑無明顯原因復發，人們應該去看醫生並進行血液檢查以檢查凝血障礙。