Being born without a birthmark may later be normal, or the birthmark may not be obvious at birth or parents may not have paid attention to it; however, it may not be a birthmark, but a skin lesion.
Birthmarks are abnormal growths of human skin tissues during the developmental period, and skin lesions of abnormal shape and color appear on the surface of the skin. Birthmarks are often present at birth, but can also appear within the first few months of life. Therefore, it may be normal for birthmarks to appear later after birth.
Some birthmarks are light in color, such as café au lait spots and non-pigmented nevi, and only become visible as the baby ages and becomes pigmented, leading to the assumption that the birthmark was not present at birth and then reappears later. Or when the baby was born, the birthmark grew in the groin, buttock cleft and other hidden parts of the body, and the range is small, parents did not notice, and only later found in life.
If it is determined that the skin does not have a birthmark, and then the skin color changes, it may be caused by skin lesions. For example, patients with vitiligo will have white patches of skin; patients with leukofuria will have white or red lesions.
If there is no birthmark on the skin and the skin color and shape change occurs at an older age, it is recommended to go to the hospital to clarify the cause and carry out relevant treatments.