我用双手死死抓住横桁，直弄得指甲疼痛。我闭上眼睛，不敢正视。
I clung with both hands till my nails ached, and I shut my eyes as if to cover up the peril.
是指脚指甲生长到肉中，指甲内嵌生长可引起疼痛，红肿或是感染。
A toenail that has grown into the skin, an ingrown toenail can result in pain, redness, swelling, even infection.
结果：在711名患者中，在基础水平有64%患有关节疼痛，79%患者指甲病变。
Results: Of 711 patients, 64% reported joint pain and 79% nail psoriasis at baseline.
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