Eczema on your legs and other parts of the body is usually caused by overactive responses by the body's immune system to an irritant.
You may be allergic to things such as pollen and anything else that could cause the eczema to flare up or even by eating certain foods such as nuts.
Eczema is caused by a number of different things and it would be a good idea to get to a doctor to get tested for allergens that can cause the flare ups of eczema.
You can get rid of the eczema by using topical corticosteroid creams and ointments either over the counter or by prescription.
Applying some apple cider vinegar to the eczema daily or soaking in an oatmeal bath can help get rid of eczema.