Last evening I discovered a brown spot on the new leaf of my Phalaenopsis. I have attached a picture to view.
I live in Florida--Zone 10a--recently we have been experiencing fall like temperatures. Lows in the 50s, Highs in the mid 70s-80, our dew points have been as low as 35-50 degrees...which means it has been relatively dry..."desert" like if you will.
Oh, that's just normal colouration like what the others said, but if you ever see such again and they are most importantly, pitted, you gotta look out for some pests infesting your plant!