A Mysterious Bump on My Knee: Diagnosis and Treatment at the Dermatologist
I noticed a bump on my kneecap and decided to visit a dermatologist.
Here’s what it looked like:

It was about 10mm in diameter and slightly raised.
It started as a small scab from a minor scratch, but I kept peeling it off before it healed. Eventually, it grew larger.
Even after it fell off once, it came back again — just like in the photo.
When I searched online, I found articles suggesting it could be skin cancer.
This might be serious…
Worried, I went to see a dermatologist.
The Diagnosis
While waiting in the clinic, I was anxious — “What if it’s cancer?”
When it was my turn, I nervously showed the doctor my knee.
Doctor: “When did this appear?”
Me: “About three months ago. It fell off once but came back.”
At this point, my anxiety peaked.
Then came the diagnosis…
Doctor: “It’s a wart.” (said casually)
“Let’s freeze it with liquid nitrogen. It’ll sting a little.”
The doctor applied a cotton swab soaked in liquid nitrogen to the wart.
It felt like being pricked with a needle.
The entire consultation lasted about 3 minutes.
What a relief…
Apparently, viral warts can return unless the virus is completely removed.
Treatment Progress
The wart was treated with liquid nitrogen three times.
Here’s how it progressed:

- Right after the first treatment, the area turned red
- After 7 days, it darkened
- After 14 days, it hardened
- By day 25, the scab began to peel
- On day 27, it came off cleanly
To be safe, the doctor applied liquid nitrogen once more.
That marked the end of the treatment.
Final Result
Here’s a comparison before and after treatment:

The wart is completely gone!
Thankfully, it wasn’t skin cancer.
If you notice a strange bump on your skin, I highly recommend seeing a dermatologist.