Is this a parasite? What is this?

I have a bump probally about the site of a mesquito bite after you itch it it stays red all the time and hurts very bad when you touch it it has a black dot on the top of the bump it is at my waist line I had a tick there before would this be the cause also I had this bump before but it went away after a week and reappeared 3 weeks later (present) can anone tell me what this is also this cureent bump has been here for about a week now and not showing signs of healing