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There may be probable muscle strain
in that area due to bad posture at work or sleep. You can apply pain killing gel like Volini
gel for 7 days for relief. Also try not to sleep on that side for few days. Don't press of turn too much to that side. Eat healthy food rich in fresh fruits and green leafy vegetables. Drink plenty of water. Get 6-8 hours of sleep a day. You will be fine.