Grandparents Raising Children Support Group
This community is dedicated to grandparents who are the primary caregivers of their grandchildren. In cases where the parents are not willing or able to provide adequate care for their children, grandparents may take on the role of primary caregivers. Join the support group to find support, share your experience, and get advice from other members.
Repetitious behavior which is done subconsciously for self-soothing is a sign of OCD usually brought on during stressful situations.
You might try to redirect the behavior to a more socially acceptable such as a stuff animal or blanket to touch or stroke.
Just a thought from an OCD sufferer. There are many other manifestation of OCD which young children exhibit including hair biting, pulling, or twirling, fingernail biting, scab picking, etc.