These lesions are described as small red or purple spots on the surface of the hands and feet caused by subcutaneous bleeding, and the edge area of the erythema is accompanied by blisters or pus, which eventually causes the patient to develop frostbite-like skin symptoms on the surface of the limb. This symptom is called a "new crown toe" and usually lasts about 12 days. Its clinical pathological symptoms are lymphatic immersion around blood vessels and around the epidermis, subcutaneous blisters accompanied by small vascular lymphocytic vasculitis, rare micro-thrombosis, epidermal necrosis
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