It looks suspiciously like a [possibly sebaceous] cyst to me (**this is not a medical assessment**) - but in an unusual location.
You need a medical examination. Because of its location, you have the usual option of going to see your GP, but the alternative of a GUM clinic. GPs usually have a lot of experience with cysts (if it is one...!) whereas GUM clinics have a lot of experience with this particular location - i.e. frenulum/penis.
It would be irresponsible to give any medical diagnosis here... go see someone who knows what they're talking about and can examine you... Good luck...
Hi LS,
Most likely just a cyst, just go to the doctor and see from there.
They are pretty common nothing to worry about but defo get an appointment just to be sure.
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