How to treat the small bumps the size of soybeans on the child's arm

Patient's question:

When getting the hepatitis B vaccine, a small lump appeared. At first, I didn't pay much attention, but later it became a lump. Now it seems like a layer of skin has peeled off, revealing red and tender flesh underneath. It's soft, and it looks like there's pus inside, but it's hard to see clearly. The baby hasn't shown any special reactions.
What kind of assistance is needed: What should be done? Is it necessary to go to the hospital?

Doctor's answer:

1. Vaccination, this is normal. Local anesthetic may reappear as red or dark red, lentil-sized small nodules, followed by redness and swelling. The center of the nodules gradually forms a small pustule, which breaks spontaneously, with a diameter not exceeding 0.5 cm. 2-3 weeks later, the wound crusts, gradually turns yellow, and after the crust peels off, a permanent scar is left locally, also known as "kashaba."
Advice:
2. For any vaccine, if the vaccination technique is not standard, this is abnormal. If the anesthetized area is not deep, within the anesthetized fat, it may cause the vaccine to be absorbed slowly in the fat, forming lentil-sized lumps.
Solution:
You can apply hot or cold compresses for about 1 month. Additionally, you can cut potatoes into thin slices and place them directly on the area while the baby is asleep, which can also help with absorption.

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