Upper respiratory allergies and inflammation and swelling of the adenoids, the tissue at the back of the nose, can cause poor fluid drainage from the middle ear to the external ear and therefore cause a blockage in the Eustachian tube. Excess fluid can lead to middle ear congestion.
1 Black skin and Asian skin have thicker and more compact dermis than white skin. This is also why blacks and Asians have fewer facial wrinkles than whites. 2  Black skin has more casual lipids and more moisture in the stratum corneum than white skin.  Black skin has 50% lower ceramides than white or Hispanic skin.
Many of the darker-skinned Latinos are Amerindian (or a mix of Amerindian and European called Mestizo) or African to some degree by descent. The lighter-skinned Latinos tend to have little or no Amerindian or African blood and are mostly European by descent in contrast.There are also various ethnic populations throughout Latin America that have effected this as well.he reason some Latin Americans are darker while others are lighter-complected is because of the varying ethnic backgrounds that make up the Latin American population.