What Causes Fluid Filled Bumps With Black Spot On Bottom Of Feet?

fluid filled bumps with black spot on bottom of feet and behind toes also on back of my kneck all over my body in a hot shower white fluid will drain out other wise they r like hard boils i have noticed a spot of black in them but fluid only comes out with hot water they are also in my hair on my head the lumps directly behind my ears are so big it is ffecting my hearing i have been to the doctor a thousand times all blood work normal but i have had a spleen ectomy