I also have skin asthma kaya I am envious of those people who got smooth skin (aside from those people who are not deprived of height. Hahaha).
I just apply corticosteroids on my rashes every time they appear. The problem is that they sometimes leave scars. So I have to apply whitening lotion din or just sebo-de-macho.
Just avoid those triggering factors of your skin asthma. Just like bronchial asthma, skin asthma has its triggering factors. Mine are dust, leaves, frequent changing of weather, smoke and some foods.
Just continue applying a moisturizing lotion that is prescribed by your doctor.
For more information, you can read this: http://en.wikipedia.org/wiki/Eczema#Treatment