I am 26 years old and for the most part pretty healthy. Work out on occasion but that is just as of recently. For a few years I have been experiencing a sporadic pain in my right lower leg. It's more so located inbetween my calf and my shin on the inner side. When it's not hurting, you can feel a lump but it's very small, like a cm in diameter. Every so often though, it's very painful and it's almost as if it swells up (the lump that is). Sometimes I am sleeping when it happens and it's so bad it wakes me up. There is really nothing I can do to comfort myself except rub around the area because if I touch it it's extremely painful. It's mostly like a sharp pain only in that spot. Touching it when it's not hurting is still pretty tender, but nowhere near the pain it brings on by itself. It's not obvious to the eye, only to touch. Not warm, just a really painful lump. Any idea what this might be?