Squamous cell carcinoma Risk figures.

I just turned 22 and I've been suffering from hidradenitis suppurative for past 9 years now. Initially the problem was just localised to my underarms but it has spread over years to my face, groin and buttocks. Normally the cysts are temporary but for past one year there has been a cyst on my left buttocks near my butt which is not going. Earlier the cysts used to come and go at the same spot but for past couple of months the cyst has turned permanent with 3 small openings which drain puss and blood all the time (which causes irritation and discomfort). Papers on the internet say that almost 50% of squamous cell carcinoma cases are based around buttocks and pelvis. Since I've relocated several times, it's been hard for me to stay in touch with a single dermatologist and every dermatologist has consulted me Isotroin (20) for hidradenitis. I also read somewhere that chances of getting hidradenitis bases squamous cell carcinoma for hidradenitis patients is as high as 5%, is that true?