URGENT: Possible Red Leg?

[Hespijo]

Hello everyone, yesterday I noticed what seemed like blood on my AGB’s front legs’ armpits and faintly on his hindlegs. See the attached photos. At first I tried washing with water but it wouldn’t come off, so I can assume it’s under the skin. He (not sure of the gender yet) is also lethargic, but this is sudden. He has been active and eating well up until 2-3 days ago. My frog has been with me for only 2 weeks.

Now I’ve read about red leg disease just a while ago and decided to act fast. I hope it’s not too late yet, whatever’s affecting my frog.

Unfortunately, a vet who can treat frogs is not available here, so I might have to do everything myself with guidance from you seasoned keepers hopefully.

Someone told me to dab an antibiotic cream without painkillers on my frog’s skin, but I was wondering if this would be the best action.

Here are some details:

Size: about 2.5-3”
Diet: B. dubia as staple and occasional superworms
Feeding Frequency: twice a day, daily; dusted with Repashy Supervite (My mistake here is I have dusted everyday for the past 2 weeks, also I figured I needed a calcium powder with D3)
Last Accepted Food: 2 days ago (he refused eating since then)
Enclosure/Substrate: plastic bin filled with drinking water which I also drink (no chlorine); recently I switched him over to cocopeat with a water dish.
Water Change: twice a day, daily
Temperature: 30C-33C
Humidity: not sure, most likely >85% (I live in a tropical country and it’s currently rainy season so temp and humidity shouldn’t be a problem)
Do I have other frogs? No

I can provide more info and photos if these are inadequate.

Thanks in advance!