Was it plain dolo that you took or some other combination?
And had you had any such experience with dolo in the past?
If no, then the rash might most probably be a manifestation of the fever. Nothing to worry about. Have a dolo 650 every 6 hours, drink plenty of water and if the rashes persist for more than a day, then visit a hospital nearby to get yourself checked.
Next Steps
Look out for symptoms like severe headache, pain behind your eyes, especially when you look up, joint pain, any bleeding points from your gums when you brush, stomach ache or passing black coloured tarry stools. If you develop any bleeding gums,black stools or severe dizziness, get yourself checked into a hospital immediately.
Health Tips
It usually would be a viral urti, which would resolve on its own. Keep yourself well hydrated, it helps a ton