Try washing with betadine and then rinse with water. Or you could wash with hydrogen peroxide 3%. Or apply manuka honey, topically, and take a teaspoon internally twice a day. Or try colloidal silver externally to clean it, and a tablespoon of colloidal silver twice a day for a few days, internally. Your local health food store might have herbal extracts to help with infection.

Growing up in the 60's and 70's tincture of iodine was in every family medicine cabinet. It came in a small bottle with and applicator. It stained the skin red and burnt like hell. In the 80's, topical creams started to appear on the market. Iodine lost favor because it burned but was much more superior in killing germs.

Here is why iodine was good for skin infections.

Iodine is by far the best antibiotic, antiviral and antiseptic of all time - Dr. David Derry

Iodine has bactericidal activity:

1% tincture will kill 90% of bacteria in 90 seconds

5% tincture in 60 seconds

7% tincture in 15 seconds

Gershenfeld, 1968

Iodine kills single celled organisms by combining with the amino acids tyrosine or histidine when they are exposed to the extra-cellular environment. All single cells showing tyrosine on their outer cell membranes are killed instantly by a simple chemical reaction with iodine that denatures proteins. Nature and evolution have given us an important mechanism to control pathogenic life forms and we should use it and trust it to protect us in ways that antibiotics can't.

Iodine kills bacteria, viruses, fungi, protozoa, and even spores of bacteria and fungi, including anthra spores. Iodine was used successfully against influenza, herpes, small pox, and chicken pox viruses. Kills parasites, bacteria, mold, yeast, protozoa, viruses--essentially all pathogens including malaria, E. coli, and Staphylococcus. When iodine was suspended in a solution, viral inactivation occurred at dilutions of 1/1,000,000. (Gershenfeld, L.: Iodine. In Disinfection, Sterilization, and Preservation. Edited by S. S. Block. Philadelphia, Les & Febiger, 1977, pp.196-218.)

Iodine kills 100% of germs in a lab petri dish and works the same on the skin...

Get a bottle of iodine….

I'd slap either a castor oil pack or a good amount of wet charcoal powder onto it, tape it up and let it ride a couple days. I might even mix up a charcoal shot and drink that, depending on how infected it was but I would fully expect a castor oil pack to take care of it. If it's extremely infected, I'd definitely do a shot of charcoal slurry - a full heaping tablespoon of it - to pull the debris and any stray infection into the digestive tract, rather than have it go through the liver. Or put a charcoal patch over the liver, either way.Otherwise, if it's not too infected, I'd just let the castor oil take care of it.

If it's possible it was a brown recluse, I'd put a charcoal poultice on it, directly, a castor oil pack over the liver and take the shot of charcoal slurry a couple times that day and for the next couple of days.

It depends how bad it is. Is it remaining a cutaneous infection or progressing to systemic infection? Secondly, how many days since it got infected?
Iodine is the first aid for bites. Manuka Honey or a real raw honey are antimicrobial. An Authentic essential thyme oil is antimicrobial, must be diluted in a base oil.
turmeric paste is also antimicrobial.

But if you get fever or other symptoms go to Urgent Care.