Answer:
I hide but my head is outside. What am I?
An action done on mosquito bites
I am merry creature in pleasant time of year as in but certain seasons I sing that you can hear; And yet I'm made a by-word A very perfect mock; Compared to foolish persons And silliest of all folk.
I go up, let out a load and then go back down. What am I?
I mirror your actions.
What is lighter than what it is made of?