Hello and hope you are doing well.
Your symptoms could be due to Hives, which develop in response to an allergic reaction, by the release of histamine. The allergen can be medications, food, extremes of temperature, exercise and viral infections to name a few. You need to keep track of what is triggering/causing this rash. So, therapy lies in resolving the allergic reactions and anti-histamines. Consult your primary care physician for therapy. If the need arises he may refer you to a dermatologist.
Hope this helped and do keep us posted.
bug bites ?? and how many bumps