Hey i got bumbs in my under arm veins is it possible that they are valves they show more when my veins are small when its cold im 21 ?

Venous valves: Those bumps in your axilla (underarm) sound like they may be venous valves. It is difficult to know without seeing a picture of them. If you are concerned, see your doctor, and he/she would be able to examine you and answer your question.

Not sure: its hard to tell without an exam. There are great clinics in your country and in a few minutes you will get an answer there