Burning pain in different parts of the body is different from itchy hives or tiny red bumps and therefore you need a complete evaluation to see what the underlying problem is.
Tests such as CBC with MCV, B12 folate levels, LFTs C3 C4 ANA renal profile are all indicated.
If there are any temperature differences or perception of change of temperature on examination, a MRI scan of the spinal cord
If you have any other symptoms such as nausea or vomiting
or weight loss
, then several other investigations are required.
I am not sure why you are taking a steroid
inhaler (i.e, whether you have asthma or COPD).
If what you mean is itchy skin, then liver function tests are indicated and a complete liver autoimmune profile if LFTs are abnromal.
Treatment would then be determined according to results.
Long acting antihistamines can be tried to see what the effect is. Gabapentin
or Gabaneuron is also another alternative if the pain was more neuropathic in nature.