Hello, thanks for using HCM.
Pains in the arm can be very discomforting especially as we get to use our arms more frequently. The upper arm is rich in important structures such as nerves, blood vessels, muscles and the shoulder joint. Each of these structures could be at the origin of your pains. However, from your description, it is more likely to be a pain involving the nerves at the level of the upper arm. This could be due to a herniated vertebral
disc or a peripheral neuropathy
or inflammation of the nerve path or a metabolic disease such as diabetes
or repeated trauma of the upper arm etc.
Other possible diagnosis include;a strained on muscle which could result from over stretching the muscles such as in weight lifting, thoracic outlet syndrome
which presents with arm pain and discoloration, rotator cuff
Effective management of your pain will require an appropriate diagnosis and as such it is necessary to visit a doctor for an appropriate examination, diagnosis and an eventual treatment.
Best regards and hope this helps.