hi everyone, 

I'm 25 and today have found a lump deep under my skin you have to press quite hard to feel it it isn't visible if you look. It's on my left bum cheek towards my back and is a bit bigger than a pea it's not painful to touch and it's hard. I spoke to a doctor over the phone who said it's probably a cyst but I can't help but worry because they haven't bothered to bring me in to feel it, especially after they let me down a few weeks ago putting off my pain as sciatica and period pains when I had a serious infection that I could of died from if I didn't go to the hospital when I did. I don't know what to do next.