Hello. Thank you for writing to us Photosensitivity is a rare but well known side effect of Oral Methotrexate. Therefore it is advisable that you must not try getting tanned till the time you are on methotrexate. Apart from restricting further sun exposure I would suggest you to use a broad spectrum sunscreen whenever outdoors. As a treating doctor I would have also suggested you to use a topical moderately potent topical steroid e.g fluticasone propionate 0.05% Or mometasone furoate 0.1% cream, to be used twice daily, over the rash. Steroids are anti-inflammatory and would help resolve the rash within a few days. Regards