Picking/biting at skin may be related to OCD, but isn't OCD in and of itself. Hoarding, also, is related to OCD, but you will probably need to talk to a mental health professional to be sure. Do you need to speak to a mental health professional? Well, that's kind of up to you. Do these behaviors impact your quality of life? Do they impact your work, your social life, or your relationships in the family? Are they causing you distress? If so, it doesn't matter if it is OCD or something else. The point is, if your behaviors are causing you distress or interfering in your life, that is when you should talk to a therapist about them. If they're no big deal to you or to anyone around you, then they're not a problem, right?