In some cases too much moisture is the problem however. Many people's eczema is caused by an allergy (all eczema is a sort of allergic reaction, I believe), and often by dust mite detritus. This is the cause of my eczema, for example.Hello,
I have told my family and they said theses things happen naturally but u should always moisturise you skin because dry skin is usually the problem and can produce eczema.
Dust mites love damp / humid conditions, and the groin is a naturally moist area (skin is in contact with skin and sweat accumulates in folds of skin), so the more moisture you have in your groin area the worse the problem will be in such cases.
Personally I can't think of many reasons why eczema would be particularly bad in the groin other than:
1. topical irritation (build up of chemicals / shampoos / lubes in public hair, contact with irritating sanitary towels or underwear, or irritation caused by shaving etc.), or
2. allergic reaction to dust mite build up in this particularly moist area
If it doesn't sound like (1) is the cause of your problem, then perhaps you should investigate (2), and if dust mites affect you (simple blood test will determine this).