How old is she? Is it hot where you live? Do you hold her a lot? Wear her a lot? The rash on her neck could be heat rash. If it's heat rash, keep her cool and dry, in as little amount of clothing as possible. Someone told me once to put baby powder on it, but I never did. The yellow scab behind her ear...could it be from a scratch from her nails? Otherwise, my first thought was eczema.