Brief Answer:
FOLLICULITIS LIKELY.
Detailed Answer:
Hello
Thanks for writing to us with your health concern.
Firstly, I would like to request you to provide some more details, that will enable me to guide you in a better manner -
1. Where EXACTLY is the bump ?
2. How many weeks pregnant are you ?
3. Does the bump happen with EVERY period cycle ?
4. Most importantly, could you upload a picture ?
Now, for the answer .
Based on the information provided so far in the question, to me it sounds like folliculitis.
This is an infection of the hair follicle.
The description of a single hair sticking out from the pus filled bump is very typical.
No, it is not common to have them EVERY period cycle, but around that time, due to
hormonal changes, the infection might be recurring.
It could be lingering inside the hair follicle, and flaring up every cycle due to periods, shaving or other trigger factors.
It does NOT indicate an STI, though you should be screened for them before embarking on a
pregnancy.
The itching could be due to the shaving, which might have irritated the pus inside the follicle.
If uninfected, such a follicle can be plucked out.
However, you are pregnant, and the pus indicates infection.
It is better to have it done by a doctor.
If the infection is advanced ( pain, swelling, discomfort,
redness, obvious pus oozing out ) - then a course of antibiotics and antiinflammatories might be required before removing the offending hair follicle.
Please do write back with further details.
Feel free to discuss further.
All the best.