Final answer:
The nurse should include the importance of avoiding scrubbing the skin and picking acne, as well as staying out of the sun when teaching a teenage boy about taking tretinoin for acne.
Step-by-step explanation:
When teaching a teenage boy about taking tretinoin for acne, the nurse should include the following statement:
Avoid scrubbing the skin and picking, popping, or squeezing acne as it can lead to longer healing time and increase the risk of scarring. Instead, use a gentle, non-abrasive cleanser and apply it with your fingertips. Additionally, stay out of the sun and tanning beds as some acne medications make the skin sensitive to UV light.