Do goiters go away and never come back if treated?

Thyroid : I assume you're talking about a thyroid goiter. If you happen to have an under active thyroid gland, then replacement therapy with a medication like levothyroxine can help reduce the size of a goiter. This would require lifelong therapy. If you had a growth in the gland, then this might require surgery. This would remove the goiter permanently. You should go see your pediatrician.