It’s very concerning to see what you’re going through. While it’s helpful to get different perspectives from the community, the best and safest thing to do is to schedule an appointment with a dermatologist or your doctor to have them take a look in person. They can give you the correct diagnosis and recommend a safe and effective treatment plan.
It’s always concerning to see something like that, but it’s really important to get it checked out by a professional. People here on a forum can’t give a proper diagnosis just from a photo. The best and safest thing to do is to schedule an appointment with a dermatologist or your doctor to have them take a look in person. They can give you the correct diagnosis and treatment advice.