Q
I'm guessing that even after the fourth day, the grafts should be in there pretty well..sweat is a natural body function; even during sleep, your body sweats, including your scalp...and as far as dust and dirt, theres plenty of that outside and inside...maybe instead of a hat, you could try wearing a bandana or two..take a couple with you at night, and change them occasionally..dont forget, keeping your scalp moist is a GOOD thing right after your surgery...