The difference between pimples and skin cancer

Every summer, I eat a lot of seafood, and maybe the seaside is also relatively humid. So every summer, some bumps will grow on my hands, and they never go away. They are very itchy and there is water in them. If I poke the small bumps, the water inside will touch other places and cause bumps. I also pay attention to my diet every day. What is the difference between bumps and skin cancer?

Patients with skin cancer usually have spots on their skin, and the surface of the skin is rough. There are small lumps on the surface of the skin, and it is easy to bleed. The bleeding area heals slowly, and small ulcers that cannot heal may appear. There are darker spots on the skin.
The edges of the bumps are not very clear, and there are irregular dandruff on the edges, and water seeps out of them. Then there may be severe itching, which often recurs. If the water seeps out, it may infect other places, so be careful.
Patients with skin cancer may have obvious moles on their skin that are not easy to disappear, especially in shape and color, which may change. Therefore, if this or that problem suddenly appears on the skin, you should seek medical attention promptly.