Do many people experience dry ears (crusty outer infection) and eczema like lesions on arms and legs from accutane?

Yes. Skin changes, specifically dryness and cracking can be side effects of accutane. Talk to your prescribing dermatologist about these complaints to determine a treatment plan. If the skin changes are painful, oozing or red, or you are suspicious there is an infection, seek the advice of your doctor right away.
No. Eczematous otitis externa is very common, particularly among people who experience some type of dermatitis in the scalp. Autoimmune skin diseases are also more commonly associated with eczematous otitis externa. Accutane is not known to be an associated cause.