Lack of blood flow to the tip of my right index finger

Patient: Hi I am a 25 yr Caucasian male I’m a smoker average hight 85klThe of my right index finger is always cold it started about 3 weeks agoIt is also slightly puffy not alot but I can notice the difference the cold startsJust past the nuckle about a I centre meter past. So my nail downI don’t were a ring never have and sometimes it has less feeling then the otherTips of my fingers I tested pain response with a small needle prickAnd it is less sensitive