Is Eczema a severe serious skin disease?

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my dad some months ago suffered from a skin porblem. he went to doctor and she prescribed it as eczema.now he is cured. but the skin remains black. now my dad needs to go to oman for employment. for visa processing he went to medical testing. medical examiner says that eczema will not be allowed for visa. is eczema is so severe disease.?my dad's visa is hanging now? is there any possibility my dad will get visa for OMAN. anybody who is in the line of visa for Gulf country council GCC is there to answer me. or anybody who knows the procedure for this?