Unknown Cysts on back and chest

Patient

Q: Hi,
I have been having some cysts on my back and chest that sometimes produce a white substance when popped, and sometimes watery liquid. The cysts are painful and when scratched may produce blood.
They heal and scar and this has me worried. What could it be?

Images: 
Unknown Cysts on back and c...-1 Unknown Cysts on back and c...-2 Unknown Cysts on back and c...-3
Doctor

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