Brain tumor on my White Cloud (Tetra)?

On my tetra there is a red bump on its head. not smalll...... BIG! It is as big as 1/3 of is body! If you look closely in the middle of it there is pinky squishy looking stuff! It looks like a pinkish red buckeye with a squishy inside. ssorry for the picture that probably popped into ur head.... I dont kno if its a tumor or not.