Rashes can occur in allergic reactions due to the presence of mast cells within the skin. During a reaction these cells release histamine which produces symptoms. An allergy rash is generally red, elevated bumps. These bumps are also known as wheals, they may also be itchy.
The type of rash experienced, location of the rash and the severity is highly individual. Rash symptoms may appear in isolation or in conjunction with other allergy symptoms. Allergic rashes can occur in response to a food item, plants and medications.
Rashes can occur for reasons other than allergies and it is important to understand the cause of a rash. Other common rashes include those from infections such as bacteria, viruses or fungi. If you are unsure about the cause of a rash please see your GP or visit the pharmacy.