Last night I felt a weird sensation on my finger and found a blister-like bump there, above my finger nail and cuticle. It has a black head to it but doesn't look or feel like a pimple. It's itchy and feels tight and full. I tend to get paronychias on my fingers in that same area and this does feel quite a lot like that but I've never had one with something black in it and I don't see any like that when I look at online photos. I couldn't get an appointment with my dermatologist till late next week. Just wondering if anyone recognizes what this might be?