Yes, it is very healthy to let your lobes go naked for periods of time. I wouldn't do this while healing, though, because your holes might close up too small to get the jewelry back in. What I like to do is take out my plugs, give them a good 10-15 minute jojoba oil massage, then leave them alone and let them breathe for 15 min. or so.
Good materials for freshly stretched ears are surgical steel, glass, titanium, or niobium. I prefer glass :) You never want to put acrylic, silicone, or organic materials into your fresh stretches. They're porous and can harbor bacteria.
As for other pointers... do not skip sizes, wait the recommended time between stretches [1-2 months for 14g-10g, 3-4 months 8g-00g], and always do your sea salt soaks! Good luck!
lobes, four gauge. left tragus, sixteen gauge.
next up: navel, ten gauge.
wishlist: lobes, two gauge.
navel, six gauge.
rook-to-helix industrial.
christina.
random microdermals.
blood roses on my back/up and down my ribcage.