Everyone may be more or less allergic, but it's about different things. That is the abnormal immunity of the human body. It is because of external stimulation that lymphocytes kill healthy cells as harmful.
Allergy this thing, contact with allergens, allergic immediately, almost without warning. But if the allergen is removed, it will return to normal immediately. Your itching is not necessarily a shower allergy. You should go to the hospital to check for allergens.
Besides, allergies show that you are too delicate. A little setback will produce an immune response. You need to be exposed to bacteria. Well, this is what the TV program "The Road to Health" said, which means that the environment around you should not be so clean, so that your body can gradually adapt to the normal living environment, rather than an environment without any bacteria. In addition, there are many things that refuse to use hand sanitizer and shower gel. Because it's too clean. Shufujia soap will do. In this way, half a year is enough for you to recover.