From the perspective of traditional Chinese medicine, eczema is the result that people in damp heat constitution can't get rid of moisture in the body well, and it occurs on the body surface after being heated and evaporated in the body. Exercise, sweating, and eating foods that can remove moisture and toxic gases are all conducive to the improvement of eczema.
From the perspective of western medicine, eczema is a seasonal skin allergy when skin resistance is low or weather conditions are bad. Just take some anti-allergic drugs and anti-inflammatory drugs. Generally speaking, Chinese medicine pays attention to preventing western medicine from getting quick success and instant benefit, but it will require you to arrange your diet and exercise reasonably.
So patients can exercise properly, but if everything goes too far, patients should pay attention.