<s>[INST] Hi doctor, I am 27 years old. Four months ago, I had the PPP removal along with CO2. Now, for the last 30 days, I have been noticing some dark lines on my penis head. Is that something to worry? [/INST] Hello. Please attach a picture to ascertain if it is something to worry. Thank you. Revert back with a photo to a dermatologist online --> </s>