No, not all skin cancers need to be removed. The decision to remove a skin cancer depends on the type of skin cancer, its size, its location, and other factors.
For non-melanoma skin cancers such as basal cell carcinoma and squamous cell carcinoma, the most common type of skin cancer, surgery is often the most effective treatment. Depending on the size and location of the cancer, your doctor may recommend removing the cancer with a scalpel, burning it off with an electric current, freezing it off with liquid nitrogen, or using laser surgery.
For melanoma, which is the most dangerous type of skin cancer, removal is often recommended. Surgery is usually the preferred method of treatment, but other treatments, such as radiation therapy and chemotherapy, may also be used.
In some cases, if the cancer is small and not causing any symptoms, your doctor may suggest closely monitoring the skin cancer rather than removing it. This is known as watchful waiting. This approach is often taken when the risks of surgery outweigh the benefits, such as when the cancer is in a difficult-to-reach area, or when the patient has a weakened immune system.
Ultimately, the decision to remove a skin cancer or not should be made after consulting with a doctor. They will be able to recommend the best course of action based on your individual situation.