You can look up here for seborrheic dermatitis: http://www.aafp.org/afp/20000501/2703.html
It is possible to have eczema affecting the ear canal. Initial treatment would be to moisturize with almond oil however if the problem is severe then steroid ear drops may be necessary however you would need an ear examination from a doctor or ENT for exact diagnosis.
Thanks for the information, the baby oil will do the same job as the almond oil. Once the initial problem has settled down then you can use the oil once or twice a week to keep the ear under control. However you should have the ear inspected to ensure that there is no perforation of the eardrum before using the oil long term.