I think some babys just look this way...
These three are siblings and all have short noses and odd head shapes compared to their parents...who have the more typical long head...
Their short noses are really strange looking as well considering they are half Suriname...
http://i142.photobucket.com/albums/r...dbabies058.jpg
http://i142.photobucket.com/albums/r...dbabies156.jpg
http://i142.photobucket.com/albums/r...dbabies203.jpg
Of course this was the weirdest head of the litter...but I suspect genetics are involved here...I actually thought this little guy was dead when he was born because of that bizzare head:O
http://i142.photobucket.com/albums/r...roswell135.jpg
Some Central American boas, though, keep those stubby noses their whole life...it's hard to say in the case of your little guy...he may outgrow it, or not...
The progress and changes of baby boas are always fun to observe as they grow up...:D
And as far as the bumps on the noses of the petstore boas, they get those from constantly trying to escape the cage they are in...most of the time the bumps will go away if husbandry is improved...but I have had a few boas with old rubs where the bump was still there...scar tissue remains...