Should I be Worried About These Lumps?
Lumps form when part of a dreadlock locks faster than another and gets shorter. Dreading is a slow imperfect process, so just let it happen. Whatever you do, do NOT just cut the loop off.
As Soaring Eagle said, is is a great thing that you managed to steer away from that. Light twisting out of boredom is okay, but putting too much stress on your scalp WILL make you bald. I have no clue why, but for some reason, us black folk are always told by our elders "MMM BABY YOU NEED TO RETWIST THAT". My sister is a loctician herself.