How not to confuse freckles with neoplasms? What should alert you?

The average freckle disappears in the cold season, it has a reddish-brown tint and does not rise above the skin. Freckles appear in places where the skin is more likely to be exposed to the sun. Birthmarks, which can degenerate into skin cancer, on the contrary, rise above it and appear on any part of the body - even on those that rarely come into contact with the sun's rays. If such a birthmark has uneven contours or shows sudden growth, it makes sense to make an appointment with a dermatologist.