Hello again,
I'm glad the photos helped to rule it out. As that allows you to see what they generally look like and you can compare. So chances are this is either due to the jelly, lowered immune system from the antibiotics etc.
It would be best to stick to any antibacterial cream. This will allow it to fight infection. Plus it will help to not burn. If you used anything else like peroxide, that can actually make it worse.
If it starts to heal, you can also use Vaseline to help keep the sores protected. Otherwise, just wash the area gently with a lather of antibacterial soap, pat dry well and apply the cream. Which can be any antibacterial cream. And since you did have the antibiotics, you may also want to eat a couple of yogurts a day too, as this helps bring back the good bacteria the vaginal area needs when one takes antibiotics.
Hope this additional information was helpful.