thyroid disorders can cause this
any sort of internal body inflammation in your organs, autoimmune disease, viral infection, liver infection, hepatitis, can cause skin manifestation.
sometimes skin rashes can be manifestations of internal inflammation.
blood work to check your CBC, ANA, ESR, C reactive protein, platelet levels, liver panel, hepatitis panel, thyroid panel can check for internal inflammation which can manifest as a rash on your skin.
these need to be done.
let me know if you have other questions.
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