Suggest Recurring Infected Blisters

I keep getting cyst full of puss & blood all over my body at an interval of time for the past 10 yrs..

Initially the cyst does not have any pore or mouth ..

then forms 2 to 3 openings & ouss & blood oozzes out

Too much pain & turns Violet in colour & the marks never goes

It remains with a mouth..now one has come up on my cheek for the last 3 yrs & doesnt go away..& looks horrible...

Plz help
Plz help