i get them too i dont know if its caused by friction or by other means but i just recently popped one earlier tonight and it was quite different from my normal ones that i get my normal ones have a decent amount of puss in them and when i pop them they tend to "explode" as you would say but this one did just like the others and exploded but instead of puss i got a thick mixture of blood and puss they arent dangerous to my knowledge just painful think of them as a massive pimple or boil i hope i have shed some light on the situation.
p.s i appologize for any spelling mistakes im tired lol
NOTICE: The information provided on this site is not a substitute for professional medical advice,
diagnosis, or treatment. Never delay or disregard seeking professional medical advice from your
physician or other qualified health provider because of something you have read on Wellsphere.
If you have a medical emergency, call your doctor or 911 immediately.