Cold, feel itchy and irritation on nose

I have been frequently getting cold form last one year. I can say in every 25 to 30 days. Everytime I get a cold, I feel the itchy & irritation on my left nose which is very strange. Not sure if this is due to allergy or something. On the 2nd day of cold, I generally have a running nose. If make my head down, water drops comes from my nose. This becomes very very painful for me.

I haven't consulted a doctor yet. If I need to consult a doctor who should I consult, is it a ENT or Allergy speacialist? Please help me.

Also if you know anything on this piculiar left nose thing, please suggst me.

thanks,
BSR

Thank you very much. Will take an appointment with ENT and update.