When our hen first got here she had a cold. It was treated and now she's all better. But when she had the cold she had a very stuffy nose so I tried everything to un block her nostrils. My last resort was peroxide to help loosen the boogies. That helped and she healed a couple days later. So in week two I noticed she had black spots on her comb. From comments on here to google, I realized they were bruises. She is on the bottom of the pecking order. But now I'm looking and her beak and comb is losing its color. The beak is turning almost all grey and the comb is turning black grey as well. Did I damage the beak from the peroxide? I know the comb could potentially be heart issues but I'm looking for other possibilities. Thanks!