So, I have had this lump in the middle of my shaft on the bottom region of my penis, it s been there since I can remember, fairly small and didn t worry about it too much.. But a few days ago it started to sting like an ingrown hair, and it s only gotten more swollen, and today I checked it again it seems bigger and now has a reddish black spot at the surface of the bump.. It doesn t hurt at the moment and I haven t done anything to irritate it