A tattoo is a form of body modification where a design is made by inserting ink, dyes and pigments, either indelible or temporary, into the dermis layer of the skin to change the pigment. The art of making tattoos is tattooing. Tattoos fall into three broad categories: purely decorative (with no specific meaning); symbolic (with a specific meaning pertinent to the wearer); pictorial (a depiction of a specific person or item).
Every scholar who reached to the degree of Ijtihad in which he properly deducts the evidence of Islamic rules from the main four sources (Quran, Hadeeth, Aql and Ijmaa') studies and understands the evidence in his own way and we can never inforce same understanding on all the Mujtahids.
Tattoo is allowed because we do not find any authentic evidence against it which can make it Haraam.
Yes it is allowed for men to apply henna on hands as tattoo provided that it does not have the name of Allah or any name of The 14 Infallibles according to obligatory precaution. Henna for men should not be like what is usually used by women.
It is not obligatory on him to cover the tattoos while praying as far as the tattoos are not promoting un Islamic values or faith.
The ruling is... "Think before you ink". :)
(For an expanded version, one can consult the below link, before they think, before they ink.)
This question has been asked a few times, and also answered by various scholars on this board.
As one example, please refer to:
According to our esteemed Shi'i jurists, tattoos are makruh. However, one must also take into consideration the 'urfi/social view people have towards it.
In general, it is not at all appropriate or befitting for a pious righteous person to indulge in such activities and get tattoos, especially to be seen with it in public. Such things are not at all a concern for genuine people of faith who care about their outer religious appearance and also their reputation.
And Allah knows best.
Tattoo must not have any word from Quran nor name of Allah and according to obligatory precaution it should not include any name of the Infallibles.
If you wear a tattoo with holy sacred names or Quranic words, it will be a disrespect and wrong to touch it with out a Wudhu.
Eyebrow tattoo is not forbidden if it does not contain a name of Allah or Quranic word holy name of any of the Infallible (according to precaution). It should not make the man look like women.
If you definitely know that this female will use your beauty services in sinful way, then you should not help her in doing wrong. If you do not know that and they do wrong later on, you will not be responsible of their sinful acts.
We are not allowed to touch Quranic words or even letters with out ablution. When tattoo is on your body with Quranic words, you must remain always with ablution which is impossible because you need to go to the toilet and sleep etc.
Men should avoid showing tattoo on their body to non Mahram women when there is a possibility of bad effect.
Tattoos are allowed as far as it is a color which does not prevent water from reaching to the skin. Females should not show their tattoos to non mahram men.