For rashes you may continue tb medicines if they are very less in area and number.. but if rash is very severe, you need to stop as advised.. if you need to stop medicine, you need to restart medicine quickly one after other.. total 4 drugs atleast .. one out of 4 drugs must be causing problem.. you need to omit the last which is not tolerated and replace with another group of drug..
But remember if rash is not very bad, continue same treatment with anti allergic medicines
Next Steps
private consult if more information needed