In the Mass General study about 244 patients reported hives after getting their first mRNA vaccine dose. The CDC notes that an allergic reaction happens within four hours of getting the shot and could include symptoms such as hives swelling and wheezing. Covid Vaccine Side Effects Study Rashes Skin Reactions Not Dangerous -- Jackson County Public Health says the COVID-19 vaccines available in the US. Hives from vaccine . Treatment for flea bites includes over-the-counter medicine and natural and home remedies to relieve and soothe itching and inflammation. Signs and symptoms of flea bites in humans include itching hives a rash with bumps red spots with a halo and swelling around the bite. Hives is an itchy sometimes lumpy rash that appears on the surface of a persons skin. By design he explained vaccines contain a recipe to help the body to fight against not succumb to a virus. Hives also called urticaria are itchy red rash-like welts. Anaphylactic reactions usually occur