Respiratory issues like asthma which restrict oxygenation of the blood can result in a condition called , in which the skin appears bluish.

The condition in which the skin appears bluish due to respiratory issues like asthma, which restrict oxygenation of the blood, is called Cyanosis.

Here are the steps that lead to this condition:

1. Asthma is a condition that causes the airways of the lungs to swell and narrow, leading to wheezing, shortness of breath, chest tightness, and coughing.

2. This narrowing of the airways restricts the amount of oxygen that can reach the lungs.

3. The lungs are responsible for oxygenating the blood. When they don't receive enough oxygen, the blood can't be properly oxygenated either.

4. Blood that is not fully oxygenated is darker and has a bluish color.

5. This blood circulates throughout the body. When it reaches the skin, the skin can take on a bluish color. This is especially noticeable in areas with thin skin, like the lips and fingertips.

6. This bluish coloration of the skin is called Cyanosis. It's a sign that the body is not getting enough oxygen.