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After being in the sun for about fifteen minutes, I have red patches that have appeared on my arms and neck. What can I do?

Yes, it sounds like you may have a sun allergy, which can cause red patches to appear on your skin after being in the sun. It's important to keep the affected area moisturized with a good cream several times a day. Taking an antihistamine like Reactine once a day may also help with any itching or discomfort. If the symptoms persist or worsen, it's a good idea to consult a healthcare professional for further advice.