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On a good quality silkie the combs should never redden. With some colours that is often more of an unrealized goal all too often, however.
No silkie comb should get bumpy. It depends on the rose comb modifier genes, and has no bearing on male versus female. Silkie comb size can be a gender indicator, but that is strictly based upon size, and since many silkie males are bred for very small combs, that is often not a reliable indicator. FWIW, I have had a couple of hens with largish combs, comparable in size to a small comb on a male. That does not mean that comb is completely negligible, but that it is only one of several indicators of gender.
Streamers are usually the best gender indicator, although build & carriage of body and tail also carry weight.