Contact dermatitis-irritation of the skin caused by contact with a foreign substance. Substances that cause contact dermatitis in many people include "poisonous" plants such as poison ivy, certain foods, some metals, cleaning solutions, detergents, cosmetics, perfumes, industrial chemicals, and latex rubber. Check out WebMD for more.
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It may be they aftershave or the perfume you use. Also it could be the bubble bath you use (if you do use some). Another suggestion is body cream, you could be allergic to these without knowing and the rash may have been building up for a while without you noticing. If it does not go away soon enough you could go and see a doctor as they will be able to give you a prescription to what you need to cure it. Good Luck! <3
Could be a yeast overgrowth - try a Probiotic supplement two times a day during meals.