from your history the diagnosis of scabies looks fine as scabies is associated with night itching and lesions mainly over the axilla, finger web spaces and groin. for your second query yes its contagious and it may spread in the following ways: 1.prolonged skin-to-skin contact, such as holding hands 2. intimate personal contact, such as having sexual intercourse 3.sharing clothing, bedding, or towels that have been used by someone with a scabies infection . Also another point in consideration is Scabies mites can live for 48 to 72 hours after falling off your body, so you need to take certain precautions to prevent re-infestation. Make sure to wash all of the following in hot water that i.e clothing, bedding,towels,pillows and These items should then be sun dried and hot iron done specially taking care of craeses

The presentation could point towards an infection like scabies which is caused by an itch mite. Meet a Dermatologist for better understanding of your current scenario and appropriate treatment approach. You can consider having OTC anti-allergic medications for symptom relief. Many a times other members of the family also need treatment to prevent relapses and can be best decide by your dermatologist. Scabies usually gets treated in a couple of days.