Sudden swelling and pain next to the fingernails may be related to inguinitis, common warts, mosquito bites and other causes. 1. inguinitis: due to bacterial infection caused by inflammation of the skin around the fingertip nail, sudden redness, swelling, pain and other symptoms can occur. 2. common warts: due to the human papilloma virus infection of the fingertip skin, easy to crack and secondary infection, redness, swelling and pain. 3. mosquito bites: mosquito bites the skin next to the fingernail, can cause the body to have an allergic reaction, causing sudden redness, swelling, pain. It is recommended that people with sudden swelling and pain next to the fingernails go to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.