i just read that lack of biotin can cause eczema and depression, lethargy, and developmental delays. never had a problem with any of the other kids but my 7 mo old has a circular form of eczema. no it is not ringworm. seen the doc three timesto figure it out. doc told me to switch to aveeno for baths and lotion and wants me to use a steroid cream sparingly to help it heal. so... thoughts? anyone? anything? can i supplement my diet with biotin? we bf.