You have provided a good description of your problem. Going by your description, you seem to have a sebaceous cyst .Sebaceous cysts are common on the upper back and it is soft to touch. It can hurt if it is infected but not otherwise.
Usually it doesn't lead to any pain in the back ,but one may experience pain if the cyst touches a superficial nerve endings. In such a case I would advise you to get it removed surgically.
For the time being you can take a pain killer with a muscle relaxant , which would give you relief from pain. I don't see any emergency at the moment and I feel you can wait for 2 weeks to consult a competent dermatologist.
Hope I've answered your query. Should you have any additional concerns, I would be happy to address it.
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Dr. Bharat Chawda
Thank you very much for your reply. I would like to add that my main concern is that my lesion might be from some kind of staph infection (which I've read online causes boils and abscesses) and that it could possibly spread and affect my spine, because of it's location. Would this only happen with a much larger skin infection? Can a sebaceous cyst also be infected this way?
Thank you for the reply.
Yes, a sebaceous cyst can get affected by a Staph infection but the infection is always localized and does not involve the spine. A staph infection of a boil can go deeper and cause cellulitis. If the cyst is very big in size, it can put pressure on surrounding structures and cause related symptoms. Such infections can be treated with an appropriate antibiotic, especially one which acts on gram positive bacteria. You may discuss with your doctor if you need such therapy. But I do not think you need to worry about your spine getting affected.
Hope, this answers your query.
Wish you good health.
Dr. Bharat Chawda.