Which of the following is an indication for hyfrecation related to vascular lesions?

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Hyfrecation is especially suited for superficial vascular lesions because the high-frequency current coagulates the tiny feeding vessels as it ablates the tissue, giving rapid hemostasis. Spider nevi are small, superficial telangiectasias with a central feeding artery; destroying that vessel and vaporizing the lesion with hyfrecation provides effective removal with minimal bleeding. The other choices are not primarily vascular lesions treated this way: actinic keratoses are premalignant epidermal lesions treated with cryotherapy, topical agents, or curettage; seborrheic keratoses are benign epidermal tumors treated with shave or cryotherapy or excision; pyogenic granuloma is a vascular lesion typically managed with excision or curettage with cautery rather than hyfrecation as the main modality.