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)

37 48

36 43

21 40

38 45

23 20

32 40

22 42

31 48

48 43

42 22

149 44

30 42

50 43

17 10

36 20

23 10