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

8 10

42 45

39 42

17 40

26 42

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16 21

37 42

10 20

15 20

16 20

21 10

7 10

17 40

25 42