Hi, i have a bump on my forehead , halfway between my right eyebrow and my hair line. It has been there for a few months, never growing in size. I could never visibly see it, just feel it beneath the skin. Over the past two days it has started to hurt and is growing in size. It is not red, and doesn t look like a pimple or a cyst - it looks as if it hit my head on something although i didnt?