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.
Black absorbs the heat most so the clothing gets hotter. I've read that the difference is low when you wear your stuff very loosely like the Bedouin and other desert dwellers do. That being said black clothing is said to protect better against sunburn.I don't know why though.atives from regions which are really hot and have a high sun intensity are wearing sometimes white/bright and sometimes black/dark colors. I mean there has to be a better strategy in terms of heat budget and radiation protection (which seem to be the two main enemies).