Not sure if it’s a sac or core? Popped this out of my boil on my thigh last night. Never had one like it. I have HS. It was rubbery and firm

12 11

28 41

32 41

11 10

16 10

32 10

57 46

24 10

13 10

29 42

38 21

70 44

50 10

13 10

26 40

19 41