Comb color change

[Ahmedkh]

My chicken comb color changed from bright red to blueish purple color in the back without any injury i live outside usa our local weather is generally hot there is no problems in eating and drinking
So what can be the problem

 

[HappyClucker7]

It could mean one of two things. Sometimes the comb can turn purple for a little bit, and then go back to normal. Or it can be a sign of heart issues. I would just keep a close eye on him for now, and see if the purple goes away again.