For the last 2 days I've had this very itchy spot on my inner knuckle of pointer finger of left hand. The area is a bit stiff when I move it. It becomes super itchy if I accidentally touch it or use it in certain angles and as I itchy it becomes painful. It's difficult to see the redness properly in most lights but is visible with torch or flash. What could this be? My mother said it may be a mosquito bite in an odd place but I've had my fair share of mosquito bites and they're usually not like this? Please advise. Thanks.