Could you post a picture? I wonder if the glasses might be some other kind of feature and not glasses, which might make them easier to bear. Some genes hang around for quite a few generations - like the Kuchipatchi genes - and may require just breeding with other tamagotchis to replace them, or breeding with the same character whenever possible. One quick work around is just to have your tama wear an item that covers up their face. You might have to hunt around for items like that but I'm sure there are some. Another alternative is feeding it a colour-changing food to potentially change those marking to a more suitable colour. Colour is passed down onto future generations so you could possibly get rid of that red entirely.