In this question, I believe you mean these, right?
In order to answer this question, we did a thorough research. According to sources, these unique lumps usually cover the entire head of humpback whale (almost non-existent in other animals) and are actually super-large hair follicles or nodules.
These nodules are about the size of human fists and are designed to protect the hair hidden deep in them (yes, whale does have hair, although not visible) - Inside each nodule there is a thick bunch of nerve cells connected to the hair, protruding a few centimeters from the middle of the muscle.
In fact, whale pimples are one of the biggest mysteries in nature, because scientists still don't know what their exact purpose is: some claim that these pimples are like beards and can sense the slightest vibrations in water, a fact that whales allow for prey (krill, the shallows of small fish...); others believe that pimples may have the ability to detect low-frequency sound waves. But the lack of evidence seems to refute these theories.
It is worth noting that whale pimples should not be confused with barnacle or parasites, which are often attached to baleen whales (such as humpback whales) and other marine wildlife in order to grow and thrive, the fact that one species benefits from another species (called hosts) without experiencing and causing any harm.
So, all in all, we still don't know what the exact cause of whale pimples is because scientists are still running on speculation lacking in evidence.
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