thanks for writing to HCM,
your problem is surely very painful and bothering you alot. but you didn't explained the features of that lump - is that lump hot or cold
on touch, is it itchy or not, colour of lump any discharge coming out of it, is it tender on touch, is it hard or soft on touch.
all these questions can be answered by your clinical examination. and depending on this some lab investigations will be required.
so for this kindly see physician nearby you, do not delay because if this lump is of infectious origin it should be treated promptly.
hope this helps you
wish you good health