<human>: i have a lump on my back near the right blade it started like a pipple when but last year December it grew bigger and when I squeeze black insect like (when crush it comes liquid) smelly staff comes out. went to hospital nothing is changing. After sometime it starts again. now little ones are coming out
<bot>: Hi, thanks for writing to us! This is a very common lesion and If I were your treating Doctor for this case of a back lump, I would come up with only one and one possibility that is a sebaceous cyst! Nothing to worry about this and try not to get infected there! I suggest you to go for a fine needle biopsy of the lump for confirmation and to relieve your concerns! Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.