Brief Answer:
Need some more information on your symptoms.

Detailed Answer:
Hi, thanks for writing to XXXXXXX

Some more information regarding your symptoms is needed to arrive at a possible diagnosis.

Please answer the questions in an elaborate manner and add any other relevant information, if possible -
- duration of your pain (since how many days are you experiencing the pain
- is the pain present even at rest or occuring only during specific movements
- any history of injury/trauma
- exact location of pain (whether on the centre of knee cap or onto the sides)
- any aggravating factors (like knee movement causing more pain etc) & relieving factors (medicines, ice packs etc)
- Frequency of pain (occuring once in a day , a week, a month etc) and how long is it persisting
- any underlying diseases like Diabetes, Thyroid etc
- any associated swelling in the knee or involvement of other joints

Regards

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Brief Answer:
It could be Neuropathic pain.

Detailed Answer:
Hi, Nice to hear from you.

Based on the information provided, most propably it could be neurogenic pain. Herpes may also be contributing to the pain (as it mostly affects the neural elements).

This pain can be effectively controlled by using medictions like Gabapentin or Pregabalin.
- Lidocaine patch -This patch contains the topical anesthetic lidocaine (Xylocaine). You apply it to the area where your pain is most severe, and you can use up to four patches a day to relieve pain. Lidocaine may help reduce pain from peripheral neuropathy.
- Local application of Capsaicin cream can cause modest improvements in peripheral neuropathy symptoms
- Transcutaneous electrical nerve stimulation (TENS) may help to relieve symptoms.

I suggest you to consult a Neurophysician for futher management.

Hope I have justified your query. Have a great day

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