The communication will allow air to be forced from the sinuses into the orbit in the presence of a pressure gradient from forceful expiratory efforts, nose-blowing or even a sneeze. Orbital emphysema is typically a harmless disorder because air escapes as quickly as it enters the fracture site, and the increase in intraorbital pressure is usually transient, lasting for as long as the sneeze or nose blowing. However, when orbital soft tissues, such as fat, falls back on the sino-orbital communication, a one-way ball valve will be created, leading to the entrapment of air. When sufficient air accumulates, it will result in acute compartment syndrome and vascular compromise, causing complications including proptosis, visual impairment, central retinal artery occlusion, compressive optic neuropathy, and other severe complications caused by orbital compartment syndrome.There are three variations of orbital emphysema, namely palpebral emphysema, true orbital emphysema, and orbitopalpebral emphysema. Palpebral emphysema
Palpebral emphysema refers to emphysema of the eyelids alone. It is a rare kind of orbital emphysema which is usually caused by fractures of the lacrimal bone. The lacrimal sac ruptures as a result of the fracture, allowing air from the nasal cavity to enter the tissues of the eyelid. Alternatively, facial subcutaneous air may simply pass into the eyelids along fascial plane to produce palpebral emphysema. As long as the orbital septum is intact, air is confined in the eyelids. True orbital emphysema
True orbital emphysema occurs when there is air behind an intact orbital septum.
Hair diseases are disorders primarily associated with the follicles of the hair. A few examples are 

Alopecia
Bubble hair deformity
Hair casts
Hair loss
hypertrichosis
Ingrown hair
Monilethrix
Premature greying of hair
Pattern hair loss
Trichorrhexis invaginataMany hair diseases can be associated with distinct underlying disorders. Piedra are fungal diseases. Hair disease may refer to excessive shedding or baldness (or both). Balding can be localised or diffuse, scarring or non-scarring. Increased hair can be due to hormonal factors (hirsutism) or non-hormonal (hypertrichosis). Scalp disorders may or may not be associated with hair loss. See also
List of cutaneous conditions

References
External links

https://www.nlm.nih.gov/medlineplus/hairdiseasesandhairloss.html