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Your skin in that area is sensitive to the sun, sun-induced erythema. You should apply sun screen, and possibly Vit E, to that area before you get exposed to the sun for a lengthy period of time. This sensitivity could improve with time. If you are taking medications, other than the cortisone, check the drug information for associated increased photosensitivity which should resolve after stopping the medication. Of course, cortisone as needed is acceptable when the erythema develops
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It would have nothing to do with the thyroid medication. Photosensitivity can develop at any age/any time, and it can resolve the same way.
Your statement above, you developed it after you went out in the sun !!
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It's obviously a mild form, and that's why it's so localized and responds well to cortisone
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