Hi I had a friend who used to get white spots after tanning and it was from a fungus. She had to put a cream on it and it eventually went away.
And just a word of advice you probably don't want to hear...tanning is very bad. lol. I tanned for eight years straight and when I finally stopped I had a mole removed that the drs. said would have eventually turned into a melanoma. And once my tan faded I realized I have a TON of new moles. You might look back and really regret spending time in a tanning booth, I know I did. Now I use the spray tanning booth instead and it does the trick. Good luck.
I recently starting to notice white spots on my left side of my face. All so my lip has lost some tone on the left side. I wonder what it is my dad has some skin dicoloration as well is it genetic?