Pharmacist advice:
I did that with my swollen feet once. Turned out that I had a bad staph infection that required immediate medical care.
I had thought that it was a Neosporin kind of situation that would clear on its own at home but after a few days of no relief I was so lucky that I asked the pharmacist when I went to buy more cream… She saw my feet and knew better.
I ended up going to the hospital by cab. My cab driver told me that his friend got a staph infection the same way that I had but by the time the friend went to the doctor it was too late and they amputated his leg (!) True story.
Anyway it was such Hashgacha Pratis that I asked the pharmacist. I didn’t know such a simple seeming thing could have such fierce consequences.
Free consult from a medically trained professional right there and then. Pretty awesome.
So that is one idea. To ask a pharmacist. Maybe even to the side privately and show the pharmacist your toe and explain.