Hot Fomentation. Gentle Shoulder Stretching. Core Strengthening Exercises. Gentle Neck Exercises. Avoid sleeping on affected side.. Warm up and cool down is a must.

This happen due to overstress in neck region. Ice is best to reduce this pain. Apply 3-4 times in day for 10 min everay time. Strecthing will reduce pain and tension in neck. Consult to physio.

Greetings, sorry to hear about your pain. Going by your complaint it is a muscle spasm and the clot like thing you mentioned is where the spasm is at its most (trigger point).  must massage the area a little harder a couple of strokes and ice the area with raw ice for 5 min to 10 min. Do this twice a day and give rest for couple of days. Along side this you can visit a physio near your place to get this finished. Avoid head bath and two wheel drive for a week or until symptoms reduces to 60%. Wishing you a quick recovery. If any concerns do let me know.

Its most likely that you have sprained your neck. That provokes muscle spasm. Often patients perceive the knotted muscle as a swelling. You can apply warm compress with a total soaked in warm water to your neck region. This will relax the spam in the muscle. You can take OTC medicines at the pharmacy. If pain persists beyond 3 days visit a local ortho surgeon.

As per your description of the condition. please answer few more questions . 1) Did you had some Injection on that particular site where you feel sweeling? suggesting of a vascular injury, (also some skin discoloration can also be noticed) , you may use anti-thrombin topical cream so that clot is dissolved (it may take 3-5 Days) 2) Did you hurt your arm like fell on your shoulder. 3) Was there some accidental pull to your arm (as in case of catching a support while falling) Either of the above 2 cases suggests muscular injury. it may be a rupture to rotator cuff. A further detailed assessment will be needed also some investigations may be needed, before we advice you anything.