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Have black dot on back, pus, now stringy stuff discharges, applied proxide, black dot reappeared with red ring

i have a black dot on my back that has been their for several months, possibly 5 months. it looks similar to a black head but once i tried to pop it pus came out in the beginning like a normal pimple..but after that only long stringy stuff came out the color of my skin. when i was finished the black dot was barely visible so i put proxide over the area and left it alone for acouple hours. when i checked my back again the black dot reapeared but this time with a red ring around the black dot. do you have any ideas what this could be?
Asked On : Thu, 11 Apr 2013
Answers:  2 Views:  1015
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Dermatologist 's  Response
From the description it probably seems to be a sebaceous cyst. Sebaceous cyst is a small swelling underneath skin which on manipulation or being squeezed discharges cheesy oily foul smelling material. It is characterised by a punctum or black spot in centre. Treatment is excision of the cyst.
You need to consult a dermatologist to get the diagnosis confirmed.
As far as redness is concerned it could either be due to peroxide application or due to inflammation that might have occurred due to squeezing of lesion.
Hope that helped
Take care
Answered: Thu, 11 Apr 2013
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Dermatologist Dr. Geetika Paul's  Response
From your history,,,seems like it can be a sebaceous cyst
A sebaceous cyst is a closed sac under the skin filled with a cheese-like or oily material.Sebaceous cysts most often arise from swollen hair follicles. Skin trauma can also induce a cyst to form.These cysts are usually found on the face, neck, and trunk. They are usually slow- growing, painless, freely movable lumps beneath the skin. Occasionally, however, a cyst will become inflamed and tender. The black dot that you see over the lesion is the punctum present over the sebaceous cyst from which occasional discharge can occur
Usually Sebaceous cyst can be left on its own but if it continues to cause problem, then you need to consult a dermatologist or a dermatologist for its removal

Hope it helps

Dr Geetika Paul
Answered: Fri, 12 Apr 2013
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