I have a mixed flock which includes 8 leghorns. They are approximately 8 months old. They lay beautifully,and I love their elegant body shape and large floppy combs. Yesterday, I noticed two of my girls had some purplish color to the back tips of their combs. It felt cold to the touch. They are both in the nest box this morning, laying eggs. All are hungry and active. No other symptoms. I checked their breathing, it is normal. No swollen eyes, or wattles. No one else has this. It has not been very cold here at all. We had one morning of freezing temps, but just for a few hours and then it warmed up. ( we live in south texas) They sleep in a very cozy coop at night, so I doubt it was freezing in there that night. Should I be concerned??