What does a painful blister with a red spot on the heel indicate?
Patient: I have developed a blister with very little fluid and a red circular dot in the middle of my left heel...I stepped on a rock through my house shoes about 2 months ago and not long after this the red dot appeared and now a blister has developed. What can this be. It is painful Doctor: Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.  It could be due excessive friction while stepping on stone.If it is very painful interfering with walking then you need to remove it by piercing and taking off fluid. It need to be covered with cotton dressing. So you need medical attention.  Hope I have answered your query. Let me know if I can assist you further.