This could be due to a condition called Blepharitis.It is inflammation of the eyelids. It is characterized by inflammation of the eyelid margins. Blepharitis usually causes redness of the eyes and itching and irritation of the eyelids in both eyes.
Seborrheic blepharitis, the most common type of blepharitis, is usually one part of the spectrum of seborrheic dermatitis seborrhea which involves the scalp, lashes, eyebrows, nasolabial folds and ears.
The most common type of blepharitis is often found in people with a rosacea skin type. The oil glands in the lid secrete a modified oil which leads to inflammation at the gland openings which are found at the edge of the lid.
The single most important treatment principle is a daily routine of lid margin hygiene as described below. Such a routine needs to be convenient enough to be continued lifelong to avoid relapses as blepharitis is a lifelong condition.
-Apply a warm wet compress to the lids - such as a washcloth with hot water - for about 2 minutes.
-Gently and repeatedly rub a very dilute soap solution along the lid margins while eyes are closed.
-Spread small amount of prescription antibiotic ophthalmic ointment with finger tip along lid fissure while eyes closed.
If these conventional treatments for blepharitis do not bring relief, you should consider allergy testing and ocular antihistamines.
Once the inflammation settles down the eye lashes will begin to grow back. If it is not due to this then other conditions should be investigated for.
This is what I have found. If any type of oil gets on the lashes it will cause mine to fall out. Also, if you use any eye cream at night, it will bleed up to the lashline and cause the lashes to fall out. I have had this problem on and off for several years and each time I find it is usually caused from an allergy or oil. Hope this helps.
Thanks for your responses. I'll try what you suggested.