Sudden Skin Bumps: Possible Causes and Treatments - Dermatology

Skin issue: Sudden appearance of numerous small blister-like rashes on the hands?

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Hello doctor, yesterday around 8 PM, I felt a burning and slightly itchy sensation in my left hand, and I noticed small blister-like rashes forming.
The skin around the rashes was red, possibly due to friction or another cause.
The rashes appeared on my palm, the sides of my fingers, and the back of my hand, with the palm being the most affected and the back of the hand the least.
After noticing the rashes, I immediately washed my hands, and the symptoms improved significantly; the burning and itching sensation subsided, and the rashes diminished considerably.
For a while, there was no itching, and I thought it was over.
However, about an hour later, my right hand developed similar small rashes, but there were many more than on the left hand.
The burning and itching sensation was also more pronounced on the right hand, and the skin around the rashes was red and painful.
Washing my hands did not help, and my right palm continued to itch persistently.
In addition to the itching, the skin was drier than on the left hand, and there were occasional pain sensations.
Yesterday, I applied hand cream, and today both hands have improved a bit.
The rashes on my left hand are now less noticeable, only visible upon close inspection, and the skin is slightly dry.
The right hand, however, continues to itch on the palm, while the other areas like the back of the hand and sides of the fingers are not itchy anymore, and there is no pain.
The rashes have decreased compared to yesterday, and the skin around the itchy areas is less red than before, but the hands remain dry and painful when rubbed.
Before the onset of symptoms, I had contact with several items: my phone, products on a bookstore shelf that hadn't been moved for a long time (I came into contact with the packaging and some unknown debris on the boxes), and alcohol sprayed by staff when entering a department store.
(After spending some time in the department store, I noticed the following situation): 1.
A sudden appearance of numerous rashes.
2.
The rashes resemble small blisters.
3.
Two out of four family members developed similar rashes a few days ago (my family members are still not well; I was the last to develop symptoms).
4.
Initially, there was a burning and slightly itchy sensation.
5.
The skin around the rashes was red.
6.
The areas on my right hand were painful.
7.
Symptoms differ between my left and right hands.
8.
Washing my left hand was effective.
9.
I had contact with various items.
10.
My mother has a history of recurrent symptoms.
11.
Among the three family members who developed symptoms, except for my mother, it was their first occurrence.
12.
My father and brother have atopic constitution, while my mother and I do not (which rules out allergy issues).
13.
The only symptoms among family members, besides the rashes, are itching.
14.
My skin feels dry.
15.
There are no stress-related issues.
16.
My grandparents and father have never had these rashes (which rules out hereditary possibilities).
17.
My right hand has a prickling sensation.
18.
My symptoms differ from my family members (my mother and brother only experience itching without pain).
19.
Rubbing my right hand causes pain.
20.
There are no peeling symptoms.
21.
The itching sensation is not very intense.
I searched online and compared images, and the rashes look like dyshidrotic eczema.
Is it dyshidrotic eczema? (My brother was diagnosed with dyshidrotic eczema two days ago, which is non-contagious, ruling out the possibility of infection).
Should I see a doctor or buy over-the-counter medication?

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Mǒu, 10~19 year old female. Ask Date: 2020/05/14