I am a male 47 years old, non-smoker, non drinker and about 65 kg. I have a black hard spot on my thumb. It is already a year since the thing appeared. It is about 1mm of diameter. First I thought there is a thorn inside and tried to take it out. It started to bleed and I stoped it. Another time I cleaned the black taint inside. It came again. It hurts a bit when I press it as it is hard. Can any one give me an explanation.
Thanks.