How do I remove extra scar tissue?!

I had a box-cutter accident 2 weeks ago, long story short, it cut through my thumb knuckle and the flesh was hanging by a 3 millimeter piece!. Instead of going to the ER, I just stopped the bleeding and applied bandages for a few days!. I used band-aids after that!. Now it has completely sealed up!. But the scar is lumpy and I cannot bend my thumb in that area without it going from pink to very white and wince in pain because it seems it will burst!. I think I will have to have a procedure to get any access scar tissue removed!. Would this be an accurate theory!? Is that what typically happens after a deep cut!?Www@Answer-Health@Com

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