do i need a doctor?

First time visitor, first time poster. I'll try to keep the background short and get to the questions. I've picked my scalp since my early teens, over ten years. There have been fluctuations over the years, but now it is currently the worst ever. I am picking near-constantly and have an open wound the almost the size of a credit card on the back of my head. I'm pretty sure it's infected since it is constantly oozing a thick, yellow-ish ooze (and to make this even more disgusting, there's a faint, but distinct, sharp, sour, odor). QUESTION 1: DO I NEED A DOCTOR IF IT'S INFECTED, OR HOW CAN I TREAT THE WOUND AT HOME? Like I said, this is the worst it's ever been. It actually caused a fight between me and my significant other when S.O. finally got a clear look the other day. Basically, significant other said that I should go to the ER for the infection and because it looked just as bad as if I was cutting myself. I said it was not self-harm (I don't hate myself or my body), just a harmful bad habit. But the conversation kind of made me wonder if I am really seeing my picking problem clearly. QUESTION 2: DO I NEED A MENTAL HEALTH PROFESSIONAL/DOCTOR? I have seen one in the past and taken medications for depression/anxiety, but am not on any now. My picking subsided a bit during this period, but I was mostly working on other things. I'm working on getting health insurance, but don't actually have any at the moment. Appreaciate all feedback on both these questions.