Tatto is against Islam

A tattoo on body of an adherent of Islam is against Shariyat, according to
a recent fatwa issued by Darul Uloom Deoband as reported on Dec 6th 2012.
The namaz offered by such a person will not be accepted. If the tattoo was
on parts of the body washed during wazoo, the person cannot offer namaz.
The person will have to get it removed.

A youth's friend got a tattoo made on his arm. Later ,he realised that he
had committed a mistake. So, he went to the doctor to get rid of it. But
the doctor said that it will need a graft surgery which involved a lot of
money. The youth, who hailed from a humble background, could not bear the
cost of it. So he asked the clerics at Deoband if his namaz would be
accepted if there was a tattoo on his body. In response, Darul Uloom's
Mufti Arif provided this ruling.  The fatwa has been supported by Bareilly
Markaz as well.

Bareilly Center (Markaz) is an Indian-based prestigious Islamic
organization that has a large following world-wide. Islamic scholar and
sufi Ahmed Raza Khan Fazil-e-Barelvi(1856–1921 CE) influenced the Barelvi
movement of South Asia and his son, Mustafa Raza Khan, commonly known as
Mufti e Azam e Hind, was born in Bareilly. Ahmed Raza Khan was an authority
on numerous topics, including Islamic law, religion, philosophy and the
sciences. He was a prolific writer, producing nearly 1,000 works in his
lifetime. These scholars were instrumental in enhancing the importance of
Bareilly Center of Islam.

The ruling is also applicable for perfume containing alcohol as well.