When I got Jasper one of his nostrils was completely covered over. I took him to the vet for a checkup and he has what the vet called Hypertrophy of the Cere. Basically, extra skin grew and covered up the nostril (kind of like a scab). The vet just removed the extra skin.
If it looks like extra skin covering up the nostril then I would take Misty to the vet to get it taken care of. I would not feel comfortable using tweasers to remove the skin myself, if that is even is the problem. Jasper has been completely fine since his vet visit, which was way back in March.
You can see in this pic how blocked Jasper's nostril was. http://i219.photobucket.com/albums/cc85/Kesprix/birds/Tiel/P1010318.jpg
If it looks like extra skin covering up the nostril then I would take Misty to the vet to get it taken care of. I would not feel comfortable using tweasers to remove the skin myself, if that is even is the problem. Jasper has been completely fine since his vet visit, which was way back in March.
You can see in this pic how blocked Jasper's nostril was. http://i219.photobucket.com/albums/cc85/Kesprix/birds/Tiel/P1010318.jpg