I have a rash that looks like chives. it usually appears in the evenings and gone by morning. i dont have any known allergies ?

Hives: If these are itchy bumps that resolve that quickly, they most likely are hives. The cause is often elusive and may be allergy to something internal or external as well as a reaction to change in body temperature or some other factor. Taking an antihistamine at bedtime may obviate the problem if you can't identify a trigger. An allergist is best to evaluate and advise you.