I had a small skin coloured growth/bump on my stomach for about three years, a couple of months ago is gained a small yellow head which some pus came out, last week it flared up and lots of pus came out, it also bled before scabbing over, when the scab came off is is now a large red bump (1.5cm in diameter) but it doesnt really hurt. I am/was concerned it could be something like cancer but I have been told it probably just an ingrown hair?