the skin is like a darker tone, and is feels very thin, and underneath it it feel hollow, like there is a piece of flesh missing.
Hi.
This sounds like a boil or a folliculitis which are both caused by a bacterial infection. As for the skin being "more elastic", would you be able to elaborate more on this?
I suggest that you have this assessed by your dermatologist. You may need oral antibiotics for this. Wash the area with a mild antibacterial soap. Also, refrain from touching or manipulating the area. These type of infections may be transmitted through direct skin to skin contact.If the bump affects a hair follicle, then this is likely to be folliculitis. Your physician may culture the discharge to help guide treatment.