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I am Dr.Amita and I would be assisting you with your concerns today.
This was most likely a sebaceous cyst which has got infected and has now burst discharging the material of cyst and the pus outside.
You may need antibiotics to be prescribed for this.
You should also get this cleaned at a doctors clinic and have it dressed.
Please reply if you need to discuss further.
Sebaceous cysts don't typically pop and drain.
A boil is another possibility.
Other lesions are possible.
Please attach a picture here and I can give you a better summary.
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Do you have a picture?
I suspect it is a carbuncle
If you had a pre existing bump prior to this episode I would still suspect that you had a sebaceous cyst which has got infected and burst.
A boil or a carbuncle would be of very recent origin and would not have been present a s a bump.
Do you need more help?