I have normal, healthy fingers. But suddenly I have developed swelling and pain near the fingernail of one finger. The skin is reddening and warmer than my other fingers. There is no apparent abrasion and I didn’t sprain or hurt my finger in another way. It’s just the fingertip above the first knuckle. It’s constant pain, especially when I touch the skin and throbbing and almost twice the size of the fingertip on the same finger of my other hand. What happened and what Can I do?