The causes of a stye
A stye is an infection of the eyelash’s pilosebaceous follicle, usually due to a staphylococcal bacteria: it's sort of boil on the eyelash. It can occur at any age, but is more common in adults.
Certain factors favour the development of styes such as :
· insufficient hygiene of contact lenses
· insufficient hand hygiene,
· rubbing the eyes too often,
· poor eye makeup removal,
· dry eye,
· diseases such as diabetes or immune deficiency favouring infections.
More information about stye :
 Source : www.ameli.fr/assure/sante/themes/orgelet/reconnaitre-orgelet (consulted on 20/09/2017)