Welcome to Healthcare magic forum,
The symptoms look like sunburn
, its not due to any medication.
My suggestion is u can start using full arm shirts or start using sun screen lotion spf15 any good brand. u have to apply sunscreen lotion just after ur bath and before 30 mins exposing to sun, u can use it morning and afternoon to get good result. Do this for one month, u will see the changes. All the best.
Hope I have answered ur question.