I am experiencing aching muscles, little bit of cough (quality: with phlegm or mucus) and skin rash (quality: red or bluish purple) on my right arm?

You just need to: see a healthcare provider as the rash can be difficult to diagnose without it being examined properly. Muscle pain and cough generally point towards a viral infection of some sort, but if you have a rash then that introduces a bevy of other possibilities. Or the two things may be caused by separate conditions. Please see a healthcare provider. Thanks for trusting in healthTap.