Thanks for writing in to Healthcare Magic!
It is spreading at threatening pace, you should not sit silent otherwise you may be ruined of your organ. It seems some very invasive infection of the skin; may be an STD
You need consult a physician of your locality, get it examined and investigated.
You will need stronger antibiotics but after investigation sample have been collected to provide insight in case of serious infections.
If you have any further query please let me know I would try to answer it for you.
Wish you a great health!