Thanks for providing more information.
As per your description,Nerve impingement at it's path can be possible cause in your case.
If you have swelling,redness on arm then muscle injury should be ruled out.
And you need to be seen by an Orthopedist for a clinical exam.
You should do gentle massage with topical analgesic ointment containing Diclofenac sodium and apply warm compresses.
Advil/Motrin can be helpful.
You should avoid weight lifting and gym exercises for a while.
Avoid activities that require you to keep your arm bent for long periods of time.
Keep your elbow straight at night when you are sleeping. This can be done by wrapping a towel around your straight elbow or wearing an elbow pad backwards.
X-ray/MRI can be done if your symptoms get worse over the time.
Hope this helps.
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