If you are experiencing a reaction to a light treatment, it is important to first apply ice to the affected area and use a gentle bath product like Aveeno™. Taking an oral antihistamine like Benadryl™ can also help with itching. Be cautious during future treatments as your skin may be more sensitive and prone to allergic reactions. If redness and itching persist or worsen after 5 days, it is best to seek medical advice.