Those bumps are rust forming from the inside of the panel out,not an easy fix,unless you know body work and welding panels well...it'll have to be cut out,new welded in and new paint blended in at the minimum...
Don't DREAM your life, LIVE your dreams
Never forget 9/11
"Welding is like a woman,Get 'er HOT and Penetrate"
Gotta LOVE a person who knows everything about NOTHING
The only Thing necessary for the Evil to win is a good man to do nothing....
"How far you go in life depends on your being tender with the young,compassionate with the aged,sympathetic with the striving,and tolerant with the weak and strong--because someday YOU will have been all of these"....George Washington Carver
Want to know what an Ironworker is and the job scope of a Journeyman?..click here...http://www.ironworkers.org/becoming/careers.aspx