There are two major pathways. In the non-scarring pathway, the hair follicles remain intact which could potentially be reversed with the proper diagnosis and treatments. In the Scaring pathway, the follicles are permanently lost due to tissue damage, atrophy, or inflammation. The severity of the pre-existing condition determines which type of<unk>  occurs. * Ophthalmologic conditions: there are multiple types of infections and are common. The gray line of the eye is a line that divides the eyelid into parts: anterior part is skin and muscle while posterior is tarsus and conjunctiva. The blepharitis is classified based on the type of eyelid involvement. Anterior blepharitis is either staphylococcal blepharitis, or seborrhoeic blepharitis which have symptoms of the presence of scales that are along the hair shaft. Posterior blepharitis is usually due to meibomian gland dysfunction. * Dermatologic conditions: there are multiple types of dermatological conditions that can result in<unk>  dependent on the location. Atopic dermatitis is associated with allergic disorders and affects the lower eyelid. Seborrhoeic dermatitis can be seen as the scaling of the eyebrows. Loss of eyebrows is commonly seen from both atopic and seborrhoeic dermatitis due to continuous scratching/touching. Psoriasis on the eyelids can result in<unk> . Others include: frontal fibrosing alopecia, ulerythema ophryogenes, acne rosacea, telogen effluvium, follicular mucinosis, and cutaneous sarcoidosis. * Nutritional Defects: Zinc is important in hair growth and the lack of zinc can cause hair loss, specifically<unk> . The main proteins in hair are biotin and iron so deficiencies would result in a loss of hair. * Infections: Unilateral<unk>  (only one eye) may occur in tuberculoid leprosy from granulomatous infiltration of hair follicles ultimately destroying them. Infections like syphilis by causing a moth-eaten appearance of the eyebrow hair loss. Viral infections like herpes or HIV can cause scarring of the eyelid, causing loss of hair. Various fungal infections like paracoccidioidomycosis can cause lesions and changes in the hair locations of the eyelid. * Trauma: Trichotillomania is a psychological disorder where the hair is pulled out or breakage occurs when anxious. Both trichoteiromania (hair loss from constant rubbing) and trichotemnomania (hair loss from constant shaving of the hair) can result in hair loss. * Drugs/Medications: The heart medication amiodarone has been reported to commonly cause loss of eyelashes and eyebrows. Cocaine abuse has shown hair loss due to the hot vapors traveling up causing burning of the hair of the eyebrows or eyelashes. Radiotherapy and chemotherapy can cause hair loss due to the eradication of the hair cells, especially when used to treat ocular tumors. * Genetics: Some of the diseases listed in the causes can be inherited.
Madarosis
Cenesthopathy
Ectopia lentis
Leukoaraiosis
Maculopathy
Acrocyanosis
Papillomatosis
Arteriolosclerosis