No, Collin isn't sick. He's not hot. He's not cold. But yes, he does have a red nose.
Collin uses a BiPAP machine while he sleeps to keep his breathing regular and deep. Why? Because he has central sleep apnea, in which his brain sometimes stops telling his body to breathe while he's sleeping. The mask he uses is very small and well-designed to make it as comfortable as possible and it only covers his nose.
The BiPAP machine works by using pressurized air to stimulate Collin's breathing. So, for 10-12 hours every night, his cute little nose is under pretty substantial pressure. The result? Happy, well rested boy. With a red nose.