Kinda a gross topic, but scabies can be tricky to sort out. At any given time, most folks affected have only a half dozen mites or so on the body. However, as they feed they inject a systemic toxin that causes a severe global itching reaction in the victim. The hallmark symptom is worsening of itching at night vs daytime. Also look for red blotches on chest after a hot shower. Very difficult to detect or get rid of; essential oils can work if you boil all your clothing and bedding first/regularly. Good luck!