Sounds like dyshidrotic eczema aka dyshidrosis to me. I had that for years. I'd get slightly different effects depending on precisely what type of skin it was on... finger tips, sides of fingers, tops, palm, sides of hands... also it was on my toes a lot. I'd get tiny dots under the skin, sometimes in clusters, sometimes red bumps like pimples, and they'd burst and leave 'dry skin' and peeling. It could be itchy as hell and also made stuff like washing dishes hellish, like my hands were covered in papercuts. My hands at times itched like mad, to where I'd practically strip the skin off scratching them, and that would help for about 1.5 seconds. It would sometimes go away for a week or two and then come back, but was present 95% of the time.

It was misdiagnosed by PCPs as athlete's foot several times, even when it was on my hands, which didn't make much sense but doctors were "oh yeah! it can be on your hands!". But my hands were quite dry. The prescription steroid/antifungal always cleared it up and it would go away for months, but OTC antifungal creams and sprays did nothing. Hmm.

Anyway, I finally figured out it def wasn't athlete's foot and saw a dermatologist. He said dyshidrosis immediately. I'd suggest to see a derma if possible. Anyway, if it is that, the treatment, other than temporary abatement from steroids, is figuring out what the trigger is. It's a pretty common autoimmune condition with 'unknown triggers', which I interpret as meaning it's different for various people. For me, it turned out to be gluten. I had to go GF for Celiac disease and my hand & foot skin issue cleared up entirely for the first time in 20 years.

Go see a dermatologist.

A few years ago I would get patches on the back of my hand that would itch and have tiny blisters. They were persistent and over the counter ointments weren't helping. Finally went to a dermatologist when they got unbearable. The first one I went to prescribed an ointment that sorta worked, but not that great. Ended up going to a second dermatologist when I found out the first one was an anti-vaxxer.

The second one was on top of his game. He straight up said the first ointment wasn't a good one to use and prescribed something much better. It knocked out the spots and itchiness after a week or two. I've had a couple of minor flair ups since, but the ointment eliminates it pretty quick. Haven't had any problems for at least a year.

If you can, go see a dermatologist.

What are you doing with that finger? Not joking.

Sounds like dyshidrotic eczema. A primary care provider should be able to diagnose that (rather than needing to see a dermatologist necessarily). Can be treated with steroid creams.

Are your hands often wet? It could be athletes foot or another fungus.

could be anything, even allergies or an infection.

Go see a doctor. They could be warts, there are many types of warts and some get very itchy. Or it could be chillblains. Or it could be something else. And you can have an infection on top if you've scratched it often. But I am not a doctor. Next time go for a checkup, which might be a good idea if you haven't for the past two years, mention it. Take photos of the finger if it's a thing that comes and goes.

DONT. ASK. STRANGERS. ON. THE. INTERNET. FOR. MEDICAL. ADVICE. SEE. AN. ACTUAL. DOCTOR...

You should see a dermatologist for an accurate diagnosis. They are far more knowledgeable than us and can suggest treatments.

Thanks to this thread, I learned that I definitely have dyshidrosis. I gotta call a dermatologist now.

One of many possibilities :
Scabies, also sometimes known as the seven-year itch, is a contagious human skin infestation by the tiny (0.2–0.45 mm) mite Sarcoptes scabiei, variety hominis. (...)
https://en.m.wikipedia.org/wiki/Scabies

I used to get these regularly on my fingers and heel of my palm for years.

Once I changed soap and shampoo away from my wife's fancy stuff to normal, basic stuff, it's all come right.

Did you put some sort of petroleum jelly like Vaseline on the hair follicle area of the finger? For me, if I do that, I can get backed up pores that create small “pimples”. If it is on the palm side then I don’t know. I learned also that I am allergic to Neosporin so it might be that if you have been re-applying it. If so, it won’t get better until you stop.

Athletes foot. Prob a fungus

I'm assuming you're not in a country where it's easy to go to the clinic.

I'm not a doctor, but I've heard people with psoriasis or allergies describe similar things if that helps.

Stop fingering your mom. 😉 (Sorry, couldn't resist)

I’ll say it; could be HSV.

https://youtu.be/Tkd9ycxCJBI?si=Ii30vthMTgwArQhg&t=12

Do you have cats?