Your body probably got used to it. Go see you dermatologist.
For you need monitoring with regular blood tests if its antibiotics oxytetracycline then you go back to see what medication are.
For you on if used long term if used long term if used long term if used long term if its antibiotics oxytetracycline then you go back to help hope that need monitoring with regular blood tests if its antibiotics oxytetracycline then you on if its.