Hello,
Eczema is a form of chronic dermatitis (rash).Allergic reaction is one of the important causes of eczema. Wash the areas several times with fresh water and do not use any cosmetic products at the sites. You can apply some calamine lotion at the rash as it will help in soothing the skin. You can take some OTC oral antihistamine medications like Benadryl or Claritin and see if it helps.
For mild-moderate eczema a weak steroid may be used (e.g. hydrocortisone as dermacort), whilst more severe cases require a higher-potency steroid (e.g. clobetasol propionate, fluocinonide). Eczema can be exacerbated by dryness of the skin. Use good quality moisturizers to prevent moisture loss from the skin.
If still the symptoms do not improve then pls get a clinical examination done by a dermatologist.
Hope it helps.Take care and pls do keep us posted on how you are doing.
I am no doctor but just a thought, could it be your pants that are causing you to break out. I am alergic to nickel the metal that they use in most pants snaps (mostly jeans). If so try to put clear nail polish on the metal that comes in contact with your skin. My alergy is too strong for this to work for me but I have found that I have to buy pants without metal snaps. Leaves me very limited. Good Luck!