When used medically, hydroquinone can be an effective treatment for skin discoloration.

在医学上使用对苯二酚可以有效地治疗皮肤变色。

Once the sun dry the tea, you need to pick out any discoloration.

一旦太阳晒干了茶叶，把变了色的挑出来。

Patients with this syndrome could be easily identified by their peculiar blue-grey facial discoloration: a typical sign of drowning.

这种综合征患者的面部是特别的蓝灰色，很容易识别：这是典型的溺水迹象。

Diagnosis is usually made based on symptoms, and looking for areas of discoloration or roughness, tenderness or inflammation in the mouth, as well as using dental radiographs.

通过临床表现，检查口中脱色、粗糙、有压痛或感染的部位，还有口摄片，都可以诊断龋齿。

In this look, the concealer is used to cover any imperfections, such as dark eye circles, the discoloration around the nose and the mouth and blend it in.

在这个妆容中，遮瑕膏是用来遮盖任何不完美的地方，例如黑圆，和嘴巴周围的肤色不均。

This results in cyanosis in the lower extremities, a blue or purple discoloration of the skin; that’s the result of deoxygenated blood mixing with oxygenated blood.

这会导致下肢的发绀，即皮肤变蓝或青紫，是由缺氧血和氧合血混合造成的。

When deoxygenated blood mixes into the systemic circulation, it’ll often present as cyanosis, a bluish-purple discoloration of the skin, which can be seen in a baby within the first days after birth.

当无氧血混入体循环，会表现为发绀，一种皮肤变为青紫色的症状，在出生后几天便可发现。

If the blockage occurs under the skin, it creates a white bump known as a " whitehead" , and if the blockage is above the skin and black discoloration occurs, it's known as a " blackhead" .

如果在皮肤下形成堵塞，那会产生一种叫“白头粉刺”的白色痘痘，如果皮肤表层形成堵塞，黑色粉刺会出现，也叫“黑头”。

Coarctation of the aorta and a bicuspid aortic valve can cause lower extremity cyanosis, meaning a bluish or purplish discoloration of the lower limbs, and can result in congestive heart failure.

主动脉缩窄和二叶式主动脉瓣畸形会导致下肢紫绀，意味着下肢呈青紫色，并可导致充血性心力衰竭。