Why i feel constant tingling in my right arm? it happens mostly when clothes touch the skin.

Unclear: This is hard to say as you did not specify where your arm is tingling. If you carry a large purse or backpack on your shoulder this can be a cause. If you were in an auto accident and had the shoulder strap pull hard on your arm this could be cause. If you recently had the shingles this is also a result after the rash has cleared. See your doctor for further advice.

Not specific.: Right arm numbness or tingling is not usually associated with specific condition, so it is important to pay attention to additional symptoms that are occurring alongside this numbness. A lack of vitamin B12, potassium, sodium or calcium, excessive alcohol or tobacco use, toxins, injuries. If the numbness in your arm lasts for a few days or does not appear to have any obvious cause see your doctor.