 [ Symptoms ] i am on isotretinoin i was at fault that i use tetracycline ointment 1 on my lip it happened just 1 time is it serious  the ingredients of that tetracycline ointment   5 gtube tetracyclin hydroclorid 50 mg lanolin 247 57 mg vaselin 4291 57 mg beeswax 272 28 mg parafin 138 57 mg does tetracycline cream on skin affect just the skin or affect inside the body [ Disease ] you will not experience any harm tetracycline is safe to be taking internally    a very common and older antibiotic available in capsule form