My little black pekin Sybil had a bit of a bald, slightly flaky head when we got her in August but this has got worse and is now quite crusty and a bit yellowy - almost like eczema. I have put diatom on it and vaseline but neither seems to make much difference - it now looks quite uncomfortable. This may be totally unrelated but she seems to have lost a bit of weight recently (although could be due to a bit of moulting) and she used to be the most fearless and had the most voracious appetite, whereas now she runs away and is quite picky with food, except corn. Can anyone suggest how I should treat her? Thanks