Final answer:
Buerger's disease, or thromboangiitis obliterans, is the subject of this question. It is characterized by the occlusion of vessels in the hands and feet and is commonly seen in young men who smoke.
Step-by-step explanation:
The subject of this question is Medicine. The condition described in the question is called Buerger's disease, also known as thromboangiitis obliterans. It is characterized by the occlusion or blockage of the vessels of the hands and feet. Buerger's disease is commonly seen in young men who smoke. The narrowing and blockage of the vessels can lead to symptoms such as pain, skin ulcers, bluish skin, or poor nail and hair growth in the affected areas.