Some bit of fatwa :
If a person does as the Prophet (peace and blessings of Allaah be upon him) commanded, and he is prostrating on soil or a rough surface, then he may get a mark on his forehead. This may generate some pride in his heart, as mentioned in the question, but if a person’s heart is filled with sincere faith and he does what he does only for the purpose of seeking that which is with Allaah, then he will not care what people say about him. But if he deliberately tries to make a mark on his forehead that looks like the sign of sujood, then this is a kind of showing off and lying, so woe to him of the punishment of a painful Day!
With regard to the aayah (interpretation of the meaning):
“… You see them bowing and falling down prostrate (in prayer), seeking Bounty from Allaah and (His) Good Pleasure. The mark of them (i.e. of their Faith) is on their faces (foreheads) from the traces of prostration (during prayers)….” [al-Fath 48:29]
-- the correct meaning of the phrase “the mark of them is on their faces” is that this refers to the light of obedience and worship, and it does not necessarily mean that there is a physical mark on the skin in the place of prostration.
Ibn Katheer (may Allaah have mercy on him) said in his Tafseer of this aayah:
“… ‘the mark of them is on their faces from the traces of prostration’ - ‘Ali ibn Abi Talhah said, narrating from Ibn ‘Abbaas (may Allaah be pleased with them): ‘the mark of them is on their faces’ means their outward appearance. Mujaahid and others said that it means khushoo’ and humility.
Ibn Abi Haatim said: my father told us, ‘Ali ibn Muhammad al-Tanaafusi told us, Husayn al-Ja’fi told us, from Zaa’idah from Mansoor from Mujaahid: ‘the mark of them is on their faces from the traces of prostration’ – he said: (this means) khushoo’ (humility). I said, I always thought that it meant this mark on the face.
He said, That may appear between the eyes of one whose heart is harder than Pharaoh’s. Al-Saddi said: Prayer makes their faces beautiful. One of the Salaf said; Whoever prays more at night, his face becomes more handsome by day… Some of them said that a hasanah (good deeds) brings light (noor) to the heart and a glow to the face, an increased provision and the love of the people.”
The point is, the fact that this mark is present on the skin and there is a change in the colour of the forehead, does not mean that a person is righteous and sincere. By the same token, if this mark is absent, that does not mean that a person is failing in his prayers. In many cases it has to do with the nature and sensitivity of an individual’s skin.
Shaykh Ibn ‘Uthaymeen (may Allaah preserve him) was asked: is there any report to indicate that the mark on the forehead caused by sujood is a sign of the righteous?
He replied:
This is not one of the signs of the righteous; the sign is the light (noor ) which appears on the face, and being content and at peace, a good attitude, and the like.
As for the mark made by sujood on the face, it may appear on the faces of people who do not even pray the obligatory prayers, if their skin is very soft and sensitive, and it may not appear of the faces of people who pray a lot and make lengthy sujood.
(Fataawaa Islamiyyah, 1/484)
In conclusion, then, if you are sincere towards Allaah and seek to earn His pleasure when you pray, then what people say will not affect you; in fact, their praise of you may be a kind of hastening of glad tidings for you in this world. So follow the Sunnah and do sujood properly, and then do not worry about whether people praise you or condemn you. We ask Allaah to make you sincere and to accept your prayers.
And Allaah knows best.
Islam Q&A
Sheikh Muhammed Salih Al-Munajjid