Most of the time, the eruption is confined to the skin, but it can also affect the eyes and cause blindness. Patients can also develop a chronic pain syndrome that can be difficult to treat.

大多时候，病变只局限于皮肤，但也能影响到眼睛，甚至造成视力丧失，另外，有时还可遗留慢性疼痛症状，变得难以治疗。

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Those who break into a sweat during exercise at least three times a week are 70 per cent less likely to develop age-related macular degeneration, the most common cause of blindness in the elderly.

每周三次以上出汗运动可使发生老年性黄斑变性的几率减少七成。老年性黄斑变性是老年人最常见的致盲眼病。

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