I don't want too kill your happiness,, but is very often the go big and small again and so on... it"s happened very often whit my son.. inside this thing is water and is very normal to go up and down.. Normally they go up.
And they can be infected and can also bleed, then they grow very much.. and after that, they can go away if we are lucky.
But never give up!.. some day they will find something to take this away
Best Regards Kurt