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Jade ,I need to know more about these rashes you are getting.Does it look like raised red rashes .Do you get red raised lines when you scratch.Do you get stomach ache or fever
along with the rash.
With the little description it seems to me as URTICARIA
,where one gets red rashes which comes and goes.Usually these rashes appear if one is allergic to either any food items ,due to any infection in the body (worms in stomach to dental caries
) , fungi or pollens in atmosphere, dust and dander etc.
If not urticaria ,rashes can also come due to soaps and perfumes ,but then it wont itch bad and would be localized to the area where you have used soap or perfume.
Treatment of urticaria would be long and frustrating.You can start with oral anti histaminics ,oral de-worming tablets ,and treatment of any localized infection in the body.There are immuno-therapy injections also available if needed.Topically calamine
lotion would give you a soothing effect.
Hope I've answered your query ,if you any further question you can write back to us.