Can Eosinophilia be treated with TCM?
In some cases yes and in others it could be helped with a combination of western medicines. Eosinophilia can arise from numerous causes ranging from acute allergic reactions, parasitic infections to conditions such as leukemia so proper diagnosis from a western perspective is key.
From the TCM side you should read "What Does Acupuncture Treat?" to better understand treating TCM diagnostic patterns in Chinese Medicine vs. treating conditions from a western medicine perspective. This distinction is crucial.
For parasitic infections, there are many possibly treatments of which the herbal formula Wu Mei Wan is one.