Answer
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
If the gap between your lips and nose causes you harm, it is permissible to have a cosmetic surgery to shorten it.
Answering your question, The Fatwa Center at Islamweb, states:
We have already stated in several fatwas that cosmetic surgeries are of two types:
– A type that is intended for beauty and good looks; we have stated that this type of cosmetic surgery is not permissible;
– The second type is the one that a person needs in order to remove harm, pain, deformity or a scar. This type is permissible and there is no sin in doing it.
The resolution of the Islamic Fiqh Academy reads:
“1) It is Islamically permissible to perform plastic surgeries, when there is a need, and which are intended to:
A) Restoring the shape of organs to the state on which a person is (usually) created. Allah says: “We have certainly created man in the best of stature.” (At-Tin 95:4)
B) Restoring the normal function of body organs.
C) Repairing physical defects, such as: cleft lip, severe bending of nose, birthmarks, excess fingers, excess teeth, syndactyly of fingers if it causes effective physical or moral harm.
D) Repairing acquired defects from the effects of burns, accidents, diseases and others, such as:
– Skin transplantation and grafting,
– Completely reshaping of the breast after its removal, or partly reshaping it (breast) because of its largeness or smallness, leading to a condition of illness,
-Hair transplantation in case of hair loss, especially in for women.”
Therefore, if the cosmetic surgery that you wish to undergo is one of these types, then there is no harm in it.
Almighty Allah knows best.
Source: http://www.islamweb.net/en/fatwa/385405/cases-that-make-cosmetic-surgery-permissible