Eyelid represents a thin layer of skin that covers and protects the eye, and the eyelid is controlled to open the eye through a specific muscle in the eye, as this is done voluntarily or involuntarily, and the function of the eyelid is to protect the eyes and preserve them from foreign bodies , In addition to the distribution of tears regularly on the surface of the eye to keep it moist, and it should be noted that the human eyelids include a row of eyelashes that take on the task of protecting the eye from dust particles, foreign bodies, and sweat . 
In fact, there is no medical condition known as an eye ulcer, as many of the symptoms that may affect the eyelid are associated with a condition known as blepharitis , and this inflammation represents a common eye disorder that results from a bacterial infection, or a certain skin condition, Such as: dandruff, or rosacea ,  and blepharitis may occur as a result of an increase in the growth of bacteria naturally present on the skin, a blockage of the oil gland in the eyelid, a hormonal disorder, or allergies,  and it may affect This inflammation in people of different ages, and it should be noted that blepharitisIt is not contagious in general, and does not cause any permanent damage to the ability to see, and blepharitis can be classified into two main types, and the following is a statement for each of them: 
- Anterior blepharitis: This is the inflammation of the front outer edge of the eyelid, where the eyelashes are attached.
- Posterior blepharitis: This is the inflammation of the inner edge of the eyelid that touches the eyeball .
Symptoms of blepharitis
Blepharitis affects both eyes in most cases, but one eye may be affected more than the other in some cases, and it should be noted that the symptoms of blepharitis tend to be worse in the early morning, and in general the symptoms of this type of inflammation are represented as The following: 
- Eyelids itch, pain, redness, or sticking to each other.
- The appearance of dandruff , or sebum secretion in the area of the eyelashes.
- Sensation of burning eyes, or the feeling of the presence of sandy particles in them.
- Increased sensitivity to light.
- Swollen eyelid edges .
- Feeling of discomfort when wearing contact lenses.
- Abnormal growth of eyelashes or, in severe cases , loss of eyelashes .
Diagnosis of blepharitis
Blepharitis is diagnosed, and its type determined by the doctor based on the following: 
- The information provided by the patient related to his health condition, and this includes taking the patient’s medical history, discussing the symptoms he suffers from, and reviewing any general health problems that may contribute to suffering from eye problems.
- The physical examination, which is based on the evaluation of the eyelids, the edges of the eyelid, the base of the eyelashes, the openings of the oil gland, the quantity and quality of tears , in addition to examining the front surface of the eyeball using an inclined lamp, which allows enlarged vision with adequate lighting.
- Agriculture, as this is done by taking a swab of secretions, and sending them to the laboratory for cultivation and laboratory testing.
The treatment of blepharitis depends on the cause that led to the occurrence of this condition, and in general the main treatments for blepharitis can be stated as follows: 
- Cleaning the eyes: Gently cleaning the eyelids may remove the biofilm and the excess bacteria accumulating on the edges of the eyelid, and the ophthalmologist recommends using warm compresses, rubbing the eyelids on a daily basis to clean them, and reducing the amount of bacteria and germs in the eyelids, and to achieve this goal Use of prescription eyelid cleansers, nonprescription eyelid-cleaning pads, or diluted baby shampoo.
- Eye drops or ointments: They represent topical medications prescribed by a doctor with the aim of eliminating the bacteria or germs that cause blepharitis, especially if there is a risk of eye infection, or a person suspects pink eye , or any other type of eye infection to Blepharitis side.
- Doctor 's office procedures : The doctor may take some procedures in the clinic in order to clean the eyelid, including: Electromechanical lid margin debridement, or thermal pulsation treatment , or light flash technique Pulsed Light).
- Dry eye syndrome: This condition is due to the loss of the eye's ability to make enough tears, or as a result of the tears evaporating too quickly, and this condition is represented by swelling and redness of the eyes .
- Conjunctivitis : This condition is the transparent membrane that covers the white part of the eyeball, in addition to the inner surface of the eyelids.
- Meibomian cysts: This condition is characterized by the appearance of a swelling inside the eyelids, and the development of this cyst is due to an inflammation of one of the Meibomian glands as a result of blepharitis.
- Eye begging : It is represented by suffering from a painful swelling, as it produces pus and develops outside the eyelid, and this condition is due to the impact of the base of the eyelashes with a bacterial infection.
- Eyelash problems: Blepharitis may cause eyelashes to fall out or grow abnormally.
- Eyelid skin problems: as exemplified by the appearance of scars on the eyelids as a reaction of the body to exposure to inflammation of the eyelid for a long period of time.
- Difficulty wearing contact lenses: Because blepharitis causes a feeling of discomfort when wearing them.
- Chalazion : This condition is due to the presence of a blockage in one of the small oil glands located on the edges of the eyelid, specifically behind the eyelashes.
- Damage to the cornea: This is due to the constant irritation of the inflamed eyelids , or the wrongly directed eyelashes.
- "Eyelid Functions and Common Disorders" , www.verywellhealth.com , Retrieved 25-5-2019. Edited.
- "Blepharitis" , Www.aoa.org , Retrieved 25-5-2019. Edited.
- "What Is Blepharitis?" , www.webmd.com , Retrieved 25-5-2019. Edited.
- "Overview - Blepharitis" , www.nhs.uk , Retrieved 25-5-2019. Edited.
- "Blepharitis" , www.medicinenet.com , Retrieved 25-5-2019. Edited.
- "Blepharitis (eyelid inflammation)" , www.allaboutvision.com , Retrieved 25-5-2019. Edited.
- "Blepharitis" , www.hse.ie , Retrieved 25-5-2019. Edited.
- "Blepharitis" , www.mayoclinic.org , Retrieved 25-5-2019. Edited.