Does anyone know what this is on my stretch mark under my armpit? It was super inflamed last month and now it’s been like this for a couple weeks. (Black covering my arm pit hair)

18 30

17 31

12 32

44 32

13 30

7 30

26 31

3 0

31 35

42 34

14 30

19 32

24 30

8 10

47 33

10 30