Dermatology Questions? Ask an Online Dermatologist.
itch or pain? When did you notice it? Are you aware of anything which might have triggered it? Any medical problems? Any medications?
It seems to be a genial wart or inflammation from friction (more likely). You should try over-the-counter 0.1% hydrocortisone cream. If it doesn't help, you should see a dermatologist.
to have a skin biopsy.
The "more likely " part is the inflammation. Apple cider vinegar seems to have made the inflammation worse. Use over-the-counter 1% hydrocortisone cream at first.
If it is GW, it is growing.