Islam generally encourages Muslims to appear neat, tidy and well groomed; this applies equally to males and females. At the same time, Islam denounces excess in beautifying oneself to the extent of altering one’s physical features as Allah created them, inflicting harm upon one’s body, or deceiving others. There are Qur’anic verses and Hadiths to that effect.
The Qur’an considers such alterations as inspired by Satan, who “…will command them (his devotees) to change what Allah has created…” (An-Nisa’: 119)
Also, the Prophet, peace and blessings be upon him, said, “In Islam, there should be no harm nor reciprocating harm.”
Sheikh M. S. Al-Munajjid, a prominent Saudi Muslim lecturer and author states that: “According to the The Standing Committee for Islamic Research and Ifta’, it is not permissible to use artificial nails, false eyelashes, etc., because of the harm that they do when they are attached to the body, and because they also involve deception and changing the creation of Allah.
In Zinat Al-Mar’ah bayna At-Tibb wal-Shara` (Woman’s Adornment between Medicine and Shari`ah), p. 33, it is stated that: “With regard to artificial eyelashes or the substances that are painted onto the natural eyelashes (i.e., mascara), the doctors say that they are made of a substance derived from nickel, or from some kinds of artificial rubber, and that they cause inflammation to the eyelids and make the eyelashes fall out.” Based on the above, it becomes evident that wearing synthetic eyelashes is not permitted in Islam, for they 1) alter Allah’s creation, 2) inflict harm upon the body, and 3) may deceive others.