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.
What is the difference between Jamaican people and black people? Some of my cousins say they are black, jamaican, cuban, and puerto rican. My thing is, what is the difference between blacks and jamaicans. I'm jamaican also, i have Jamaican ancestry. But are jamaicans and black people both africans? Some people say i'm half jamaican, and half black. Isn't that the same thing?