An adolescent female calls the clinic with concerns that her acne is worse one week after starting topical tretinoin. What would be the appropriate care for her?

Switch her to an oral antibiotic to treat her acne.

Advise her to apply an oil-based lotion to her face to soothe the redness.

Reassure her that the worsening of acne is normal and it should improve with continued use.

Change her to a different topical acne medication as she is having an adverse reaction to the tretinoin.