My 2 yr old dog, neutered at 8months, developed an extremely painful lump in his scrotum. He was given steroids and antibiotics that he recently completed taking. Now half way between his scrotum and penis tip he is developing another lump(the first one is going away)in the center if the shaft. It seems painful as he is holding his leg up and away from the area and he's now wanting to lick often again. What's going on?