If you are in the menopausal age, then crawling sensation on the skin is a common symptom. Hormone replacement therapy often helps. It is also seen in people who are very anxious and stressed out. Take up yoga, deep breathing exercise, walking etc to relieve stress. Music and aerobics are also good stress busters. Drink plenty of fluids and water (not caffeine), eat fresh fruits and vegetables and keep yourself busy throughout the day. Very dry skin and disorders of thyroid gland all can precipitate a crawling sensation. The other possibility is Morgellons disease often mimics scabies. The disease is believed to be caused by weak immune systems in people that have contracted the tick-borne Lyme disease at some point in their life. It can also be a fungal infection like Tinea corporis.
The red dots under your skin could be a bruise. Deficiency of Vitamin B12, folic acid, or Vit K could be the cause. The other possibility is SLE. The rash can also be petechiae, which are pinpoint-sized red dots under the surface of the skin. They can result from autoimmune disorders, such as lupus or rheumatoid arthritis, bone marrow disorders such as leukemia, inflammation of the veins, as a side effect of certain medications like birth control pills. A comprehensive investigation is required keeping all the points in mind. Do discuss this with your doctor and get yourself examined. Take care!