Most people will develop small brown moles that are harmless. They may be flat, dome shaped or bumpy looking. These moles usually will appear throughout their childhood, but some new moles may appear in adulthood or after pregnancy.
Most of the times, these moles appear due to our genetic predisposition. However, sun exposure can also trigger new moles. We pay special attention to moles because sometimes these can change and melanoma (a dangerous type of skin cancer) may arise from an existing mole.
If you have >50 moles on your body, you may be at a higher risk of developing melanoma. If you have a family history of melanoma, you should also be more vigilant and undertake annual skin checks.
Hope this clarifies!