Photosensitivity?: If the rash is present only on sun exposed skin, and not typical sunburn, it might be a photosensitivity reaction, if you're taking any medications. A common cause is a tetracycline antibiotic, such as doxycycline, but several other drugs can do it as well. If you're taking any new drug, contact the doctor or clinic who prescribed it. Otherwise see your doctor soon for diagnosis and advice.
Answered 7/5/2019
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