I am experiencing rash (quality: itchiness, crusty, bumpy, flaking or scaling) , fatigue, abdominal pain (generalized) (quality: stinging or burning sensation) (severity: mild) , cough (quality: barky, hoarse, or hacking sounds) , unintentional weight lo

Many possibilities..: Rash spots can be from many causes, such as: hives, viral infections, medication causes, hot-tub rashes, heat rashes, reactions to creams or lotions, allergic reactions to some things (including foods), internal medical disorders, etc... That means a rash that persists or is worrisome in appearance should be examined. Abdominal pain also has many possible causes. Primary care doctor can evaluate.

Weight loss: a rap sucks when you associated with abdominal pain and weight loss. Would be suspicious for infection some type of an inflammatory process at his lupus would be possible.