I keep mine in a drawer and have been fortunate enough to not have any lipsticks melt. I do check them regularly just to be sure the troops are fine though. The one lipstick that went weird on me was Lady Bug (Lustre). It looked like the lipstick had been sweating and then dried up, leaving a "frosty" white residue all over the lipstick. It smelled fine, but there was no way I was even going to put it on again, which is a shame since I wore it a lot in the few months I had it. Stick your lipsticks in your fridge for a bit if you see them start to soften or just store them somewhere away from direct sunlight and heat.