my mom has a severe rash all over her body, it started 4 months or so ago and has gotten worse. she has been treated with numerous creams, prednisone, changes in soap, detergent and the like. taking warm baths not hot. biopsied, cannot find the cause. could this be from her thyroid medication (levothyroxine) which she has only been taking for a little over 2 years. can she stop taking it without other effects. she is 91 yrs young.