Bed bugs? mosquito?: Ticks, mosquitoes, bed bugs, spiders, and wasps can leave bruises at the site of the bite. Bites which occur while you sleep and are itchy are likely to be bed bugs, mosquitoes or possibly spiders. Topical Hydrocortisone and avoidance of future insect bites are helpful. The bruising is caused by a chemical the bug uses while feeding. If problem persists see your doctor.
Answered 3/30/2017
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